Rainfall monitoring device

The utility model provides a rainfall monitoring device. The rainfall monitoring device comprises an outer shell, a rainfall measurer, a measuring cylinder, a driving mechanism, a rainwater collecting hopper and a water flow control mechanism, the lower port of the measuring cylinder is in sealing fit with the upper end face of the rainfall measurer to define a rainwater measuring cavity, and the measuring cylinder drives the water flow control mechanism to act to open or close the rainwater collecting hopper when moving in the vertical direction; when the rainwater collecting hopper is opened, collected rainwater flows into the rainwater measuring cavity, and when the rainwater in the rainwater measuring cavity reaches a preset amount, the measuring cylinder drains the rainwater and controls the rainwater collecting hopper to be closed at the same time; when the measuring cylinder moves to the first position, the rainwater collecting hopper is controlled to be opened again; the rainfall measurer repeatedly m