2019年百度AI開發者大會喺7月3號到4號喺國家會議中心召開。李彥宏喺7月3號9點30分到10點進行開場主題演講。李彥宏講緊自主泊車解決方案進展時，一個男人右手攞住樽怡寶礦泉水快步行去李彥宏嗰度，將支水樽倒立喺李彥宏頭頂上，啲水就淋到李彥宏頭上。同時佢左手撳住李彥宏嘅左手，唔畀佢反抗。李彥宏本能噉低頭，俾淋咗水後用左手擦洗面部，同時對住條已落咗臺下條友講：“What's your problem?”（「你有問題啊？」）之後現場陷入沉默，幾個工作人員快步行到淋水者度。李彥宏清咗下喉嚨，之後臺下有觀眾嗌「李彥宏加油」，全體觀眾鼓掌。部分觀眾起身睇現場係乜情況。掌聲過後，李彥宏話：「大家睇到喺AI前進嘅道路上都係會有各種各樣諗唔到嘅事情會發生。」觀眾又鼓掌，李彥宏繼續講：「但係我哋前行嘅決心唔會改變，我哋堅信AI會改變每一個人嘅生活。」觀眾再次鼓掌。跟住，淋水者俾安保控制。朝陽警方接到報警後，對嫌疑人因尋釁滋事處以行政拘留5日嘅處罰。
The 2019 Baidu AI Developer Conference was held at the National Convention Center from July 3rd to 4th. Robin Li delivered his opening keynote speech from 9:30 a.m. to 10 a.m. on July 3. Robin Li said that when the autonomous parking solution was progressing, a man walked to Robin Li with a bottle of Cestbon mineral water in his right hand, and put the water bottle upside down on top of Robin Li's head, and some water was poured on Robin Li's head. At the same time, he suppressed Robin Li's left hand with his left hand to prevent him from resisting. Robin Li instinctively bowed his head like this, scrubbed his face with his left hand after being drenched in water, and said to a friend who had already left the stage: What 's your problem? " ("Do you have a problem?") After that, the scene fell silent, and several staff members walked briskly to the drenchers. Robin Li cleared his throat, and an audience member shouted "Come on Robin Li" backstage, and the whole audience applauded. Some of the audience got up to see what was going on. After the applause, Robin Li said, "Everyone can see that there will be all kinds of unexpected things happening on the road of AI. The audience applauded again, and Robin Li continued: "But our determination to move forward will not change, and we firmly believe that AI will change everyone's life. The audience applauded again. The drenched person was then restrained by security. After receiving the report, the Chaoyang police sentenced the suspect to 5 days of administrative detention for picking quarrels and provoking trouble.