The scheme is proposed of a hydraulic crawler type driving system that dual valve controlled dual motor, according to the operating characteristics of the photovoltaic panel cleaning robot. For the demand of robot running in a straight line, the synchronization control strategy of crosscoupled dual passes at equal type was presented. The mathematical model of valve controlled dual motor synchronous control system was built. The original design system model and corrected model with Proportion Integral Derivative (PID) were simulated by the way of the Siumlink, for analyzing the properties of the systems. The simulation results show that the speed of response and precision of the corrected system are improved greatly, and the system can be matched well with the requirement functions of the Photovoltaic panels cleaning robot.