Photovoltaic power generation technology has become increasingly mature, and photovoltaic power generation has been greatly promoted, so that new energy can be more fully utilized. In view of the problem that the photovoltaic battery can not be effectively monitored in the process of power generation, this paper designed a set of photovoltaic power generation monitoring system based on the PC monitoring software built by VS2012 and the Internet of things technology. In this paper, for each part of the system design are introduced, including the brief introduction of the controller and inverter, PC software design, the detailed introduction of system communication, has carried on the system diagram drawing system，and has drawed the system block diagram of the system. Experimental results and field applications show that the system can effectively monitor the photovoltaic power generation, and make an early warning in time.