Multi-use mobile robot and obstacle surmounting method thereof

A multi-use mobile robot comprises a robot body 4, at least one pair of propelling systems 1 disposed on two sides of the robot body, at least one pair of buoyance regulating systems 2 disposed on the two sides of the robot body, an acoustic-optical detection system 31 and 32 disposed on the robot body, and a control system disposed in the robot body. The propelling systems are used for propelling the robot to crawl under the water and advance on the water and in the water. The buoyance regulating systems are used for regulating self-buoyance according to different tasks to allow the robot to perform a task on the water, in the water or under the water. The acoustic-optical detection system comprises an underwater laser detection device 31 and a sonar detection device 32, and sends detected images back to the control system, and the control system instructs the propelling systems and the buoyance regulating systems to act after performing recognition and determination. The propelling systems may use the Archimedean spiral propelling principle, thus having good mobility on the shore, on the water, in the water and under the water.