Effective monitoring of photovoltaic system can make the operation condition of the system easy to know, and can also provide powerful data support for the further research. General monitoring method is to confirm the state of photovoltaic system by monitor the inverter unit’s some parameters relevant. This paper focuses on the monitoring of PV module, in order to get more accurate data, and then improve the efficiency of the PV system. Achieve the purpose of monitoring by the wireless sensor network constructed by sensor nodes that is designed proper for the acquisition of solar modules’ parameters data relevant, the monitoring application software also has been completed. The results indicate that the monitoring system who achieves the design requirements and expectations well, also with the characteristics of cost saving and convenient to set up has promising prospects.