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The system uses AT89S52 as the control center,uses rain filler, filling bottle and pressure transducer as colleting module, then translate the quality of the collected water to the rainfall. In order to enhance system’s performance, it uses NRF24L01 wireless data transmission module to connect to the upper by serial ports, and provide a method to check out and research the historical volume. The upper uses VB to design a chart, and present the rainfall by diagram in curve, which can set the highest limited alarming rainfall volume automatically. The system has low cost and installs conveniently, can monitor rainfall in real-time and can display and storing data automatic, has great promotion value.