Rainfall sensor (transmitter) is suitable for meteorological stations (stations), hydrological stations, agriculture, forestry, national defense and other related departments, and is used to remotely measure liquid precipitation, precipitation intensity, and precipitation start and end time. This instrument strictly organizes the production, assembly and verification according to the national standards of tipping bucket rain gauge. It can be used for automatic hydrological forecasting system and automatic field forecasting station for the purpose of flood prevention, water supply dispatching, water regime management of power stations and reservoirs.