Air conditioning system and drainage method of air conditioning system

The invention belongs to the technical field of household appliances, and provides an air conditioning system and a drainage method of the air conditioning system. The water storage tank is arranged below the evaporator, and the water storage tank is suitable for storing condensate water generated by the evaporator; the condenser is arranged outside the water storage tank; the water fetching device has a draught depth in the water storage tank, and the water fetching device is configured to fetch water in the water storage tank to at least part of the outer surface of the condenser during rotation; the liquid level detection element is suitable for detecting the water level in the water storage tank; the control module is in communication connection with the water fetching device and the liquid level detection element, and the control module is suitable for controlling the immersion depth of the water fetching device to be within a preset depth range according to the water level information detected by the li