Underwater propelling system for hydraulically controlling advancing and steering in water

The underwater propulsion system comprises a power oil way (1), the power oil way (1) is connected with a left hydraulic motor (6) and a right hydraulic motor (2), and the left hydraulic motor (6) and the right hydraulic motor (2) drive a left propeller (5) and a right propeller (3) which are symmetrically installed at the tail of a vehicle body. The left hydraulic motor (6) and the right hydraulic motor (2) receive steering signals from a steering wheel through the control wire harness (4). The hydraulic motors are symmetrically arranged at the two ends of the rear side of the vehicle body and serve as advancing power of the all-terrain vehicle, and left and right stress of the vehicle body is inconsistent by controlling the rotating speed of the left and right motors to achieve the steering function. When the all-terrain vehicle runs on the water, the steering wheel is used as signal input, electric signals are transmitted to the hydraulic motors by rotating the steering wheel, differential speed is formed