The invention discloses a defrosting control method; a condenser comprises a windward side and a leeward side; the defrosting control method comprises the following steps: detecting the wind speed of the windward side of the condenser, and detecting the wind speed of the leeward side of the condenser; generating a wind speed damping ratio according to the windward side wind speed and leeward side wind speed; controlling an air conditioning system to defrost the condenser according to the wind speed damping ratio. The invention also discloses a defrosting control device; the method firstly detects the condenser windward side wind speed and the condenser leeward side wind speed, then generates the wind speed damping ratio according to the windward side wind speed and leeward side wind speed; the method then controls the air conditioning system to defrost the condenser according to the wind speed damping ratio. Therefore, the defrosting process can be stopped only when the frost in the condenser is fully cleaned, thus enabling the system to timely clean the frost in the condenser.