Automatic residual liquid discharging device of water pump and fire fighting truck

The utility model provides an automatic residual liquid discharging device of a water pump and a fire fighting truck. The automatic residual liquid discharging device of the water pump comprises a residual liquid discharging pipeline assembly and a control assembly. The residual liquid discharging pipeline assembly comprises a liquid discharging pipe used for discharging residual liquid in the water pump and a multi-way pipe communicated with a liquid outlet of the liquid discharging pipe. One pipe opening of the multi-way pipe is connected with an electric ball valve used for controlling the liquid discharging pipe to be connected or disconnected. The control assembly comprises a sensor used for detecting liquid in the multi-way pipe and a controller electrically connected with the sensor, and the controller receives a liquid level signal sent by the sensor and is used for controlling the electric ball valve to be opened or closed. According to the utility model, the control assembly is adopted to detect the