What is the reason of devaluation in Turkish Lira? I guess there is a some fundamental issues in the economy but I wonder the apparent reason of the recent devaluation in Turkish Lira?

Does Turkey need to pay debt in very short term? How much is it? What is the reason of the debt?
The recent shift was likely two major interrelated reasons:

First, there was already relatively high uncertainty regarding the future viability and value of the currency (as @zeta-band noted, they're already incurring high deficits).

Second, Erdogan has made statements suggesting that, if re-elected, he'll take more direct control over the central bank. Given that he'd likely institute policies that would lead to higher inflation (or force haircuts on foreign debt holders), investors see that as a worrying potential future outcome.

Though at the same time, the rising interest rates (which, while lower than rates in Turkey, are higher than they were previously) in other Western countries has made investment in places other than Turkey more alluring, which also can devalue the Lira.

EDIT 2:

Perhaps clarifying that sentence a bit would be helpful (I left off an implied phrase, which is bolded below, which might have led to confusion)


  rising interest rates in other Western countries has made investment in places other than Turkey more alluring than they comparatively used to be. 


I'm saying investors consider a variety of different factors when deciding where to invest. If everything about two countries was absolutely equal (both currently and into the future) then we would expect the investor to put more money in the country who has comparatively higher interest rates. However, this all else being equal assumption clearly never holds in the real world- countries have different political risks, economic risks, exchange rate risks, etc. that investors consider. 

At the same time, even if every investor evaluates all of these risks identically (meaning everyone looks at the risks in both countries and agrees how likely each event is to occur, and how each one would affect any given investment) we'd still expect to see some variation in investment patterns. Why? Because every investor is optimizing over an entire portfolio, and is considering different specific investments. Additionally, every investor has their own risk preference, a more risk averse investor might be willing to forgo a higher expected return in one country for the comparative "safety" of another.

Which takes us back to the case of Turkey. It's true that the interest rates set by the Turkish government are quite high compared to other countries. However, if you're a US-based long term investor (meaning here the projects you'd be investing in wouldn't allow you to get a return on your investment for a long time) you might be worried about other perceived risks (like future inflation) that would make the high interest rate not enough to overcome the potential risks.

So what do we see? We see that there are some international investors who choose to invest in the US (or Europe, China, India, etc.- just not Turkey), some who choose to invest in Turkey, and some who split their resources between them. Furthermore, we can ask a hypothetical question: for investors in group 1 (non-Turkey investors), all else equal, how high would the interest rate have to be to induce you to invest? Clearly the answer is higher than the current rate, but at the same time, we'd expect at least some of them to shift investment if the Turkish interest rates were 75%. Clearly, as the Turkish interest rate goes up, more and more of those investors would shift resources into Turkey.

What we can then do, however, is consider that second and third group of investors (those who invest at least some of their resources in Turkey) and as them "how would your portfolios change if the US interest rate wasn't 1 or 2%, but 50%?" Obviously, we'd expect those investors to shift at least some of their investments from Turkey to the US.

The critical thing, however, is that there isn't a discontinuity. That means that as one country raises their interest rates a bit, some investors would likely shift some of their resources into that country. What we care about is the marginal investment in each country- the investment that was only just barely worth it given the conditions. These are the investments that we expect to shift.

So in conclusion, what's driving the devaluation is two fold. On one hand, there's a perception of increasing risks inside Turkey. On the other, the return for investing in places like the US are increasing from what it was previously. These two forces (one pushing down the attractiveness of investment in Turkey; one pushing up the attractiveness of investment in the US) are working in the same direction- to push investment out of Turkey, devalue the currency, and push them into other countries.