Abstract: Aiming at the lightweight design of the cleaning robot for the maintenance of solar photovoltaic（PV）power station,the structure and drive system of the disc-brush PV cleaning robot are proposed and designed. At first,based on the present wheel driven robot,the disc-brush is integrated with the drive wheel of robot,and a compact robot structure is designed. The cleaning of PV module surface and movement of robot can be realized simultaneously. The dimension of motor support is also optimized. Then,using the fourwheel drive mode,the hardware and software of drive system of the disc-brush PV cleaning robot are designed. The experiments on the surface of PV module on the rooftop are implemented. Experimental results show that the designed structure and drive system of discbrush PV cleaning robot satisfy the cleaning requirements. On a sunny day in summer,a PV module with 2.44 m~2area is cleaned.Comparing the normalized current-voltage（I-V）characteristic of PV module before and after cleaning,the maximum power of PV module corrected to standard test condition（STC）is enhanced approximate 16.1% after cleaning.