Abstract: Provided in the present application is an underwater robot, including a robot body and a trigger mechanism. The trigger mechanism includes a sealed cabin, a driving mechanism, and a sensing structure, where the sealed cabin is disposed in the robot body, and the sensing structure is disposed in the sealed cabin and electrically connected to the driving mechanism. The sensing structure is configured to detect whether the underwater robot enters water, and trigger the driving mechanism to work, so that the underwater robot moves in the water and performs cleaning.