Air conditioner and sterilization control method thereof

The invention discloses an air conditioner and a sterilization control method thereof. An external sterilization module starts a negative ion generator in the operation period of the air conditioner and controls a fan to operate in the forward direction, so that negative ions are driven into a room to sterilize the room; and an internal sterilization module starts the negative ion generator when receiving an internal sterilization instruction and controls the fan to operate reversely, so that negative ions are driven into the air conditioner to sterilize the interior of the air conditioner. On the basis of an existing air conditioner with a negative ion sterilization function, negative ions generated by the negative ion generator are brought into the air conditioner through reverse rotation of the fan in the mode that the running direction of the fan is changed after the internal sterilization instruction is received, sterilization is carried out on a sterilization blind area in the air conditioner, on the pr