Currently, the photovoltaic power generation system lacks professional operation and maintenance, and the problems can not be solved in time, which will affect the power generation efficiency and economic benefits. This paper proposed a self-service operation and maintenance system based on mobile APP client through pho- tovoltaic power generation. This system has real-time monitoring module, fault warning module, fault reporting module and manual control module, together with the establishment of event database, which can be able to pro- vide data support for the system. The owner can view the real time monitoring of the photovoltaic power genera- tion system, the equipment warning and the equipment failure through the APP, so as to find the problems in time. The owner can carry out the self-service maintenance of the photovoltaic equipment after obtaining the corresponding solutions through APP. Finally, by taking 1.8kW's household type photovoltaic power generation system as an example, this paper evaluated the maintenance benefit of the proposed system. The research results show that the system can effectively reduce the cost of photovoltaic operation and maintenance, and improve the efficiency of power generation.