In order to improve the efficiency of water garbage cleaning and reduce the labor cost, a multifunction underwater robot was designed to clean the water and underwater garbage. The robot is equipped with a garbage collection device that can control the opening and closing of the cabin door to store the collected garbage. A five-axis robot arm can complete the fixed-point cleaning of the garbage below the water surface, a vector propeller that can rotate in the longitudinal and circumferential directions, and a traditional lithium battery system and a new aluminum-water battery system. The results show that the posture of the robot in water is more stable, and the robot can work in different waters.