Full-automatic cleaning device for water tank

The full-automatic water tank cleaning device comprises a water tank, a water supply pump set, a control system and a cleaning water supply mechanism, the water supply pump set is connected with an external municipal water supply pipe and connected with the water tank through a first electric valve, and a liquid level detection device is arranged on one side of the bottom of the water tank and connected with the water tank through a second electric valve. A drainage pipeline is arranged on one side of the bottom of the water tank, a cleaning nozzle is arranged at the top of the water tank, the cleaning water supply mechanism comprises a booster pump and a dosing device, the municipal water supply pipe is connected with the booster pump through a second electric valve, and the booster pump is connected with the dosing device through a first pipeline. The dosing device is connected with the cleaning nozzle through a second pipeline, a first electromagnetic valve and a second electromagnetic valve are arranged o