The invention relates to a full-automatic solar panel array surface cleaning system. The system comprises a cleaning system and a moving system, wherein the moving system is composed of a group of retractable triangular bracket, the whole triangular bracket is partly arranged on a solar panel and is fixedly connected with solar panel maintenance equipment, power output equipment, a transmission mechanism and a balance mechanism; torque output by the power output equipment transfers power through the transmission mechanism so as to drive the solar panel maintenance equipment to march along a panel array; the cleaning system is arranged on the moving system, and the moving system and the cleaning system are fully automatically driven through a servo motor so as to automatically maintain andclean the surface of the panel. The system has the advantages of simple structure, low cost and high efficiency, does not affect the design and mounting of the current solar panel array, does not damage the surface of the solar panel, does not pollute environment, saves human resources, reduces carbon emission, and reduces comprehensive power consumption.