A cleaning device for a fan coil unit. The invention belongs to the field of fan coil cleaning. The purpose of the present invention is to provide a cleaning device for fan coils, which can automatically clean the fan coils and ensure the cleanliness of the air from the fan coils. The device of the present invention is composed of coil pipe, nozzle array pipe, nozzle, conveying pipeline, compressor, suction pipeline, water suction pipeline, water pump, detergent storage tank, controller, dirt detection device, motor, transmission mechanism, slider, guide Rod, valve one, valve two, brush rod, volute one, volute two, air outlet blade, air outlet blade adjustment device, groove and hair brush. The invention utilizes high-pressure air flow washing, brush contact wiping and cleaning, and detergent atomization and spraying technologies, and uses the electric signal loop of the controller to control and adjust the equipment, thereby realizing automatic cleaning of the fan coil unit and ensuring efficient dust removal and cleaning. Sterilize. The invention is suitable for the heating and cooling system of the terminal wind disk.