The invention discloses an air conditioner mosquito repelling device. The air conditioner mosquito repelling device comprises a mosquito repelling device connected to an air conditioner indoor unit, wherein the mosquito repelling device comprises a base and a mosquito repelling shell connected to the base; one side of the base is used for connecting the air conditioner indoor unit, and the other side of the base is equipped with a guide rail; the guide rail is in sliding connection to a guide slot in the mosquito repelling shell; a ventilation opening is formed in the mosquito repelling shell;a mosquito killer is mounted in the ventilation opening; the mosquito killer comprises a mounting hole which is formed in the bottom of the ventilation opening for mounting liquid for killing mosquitos, and a PTC heating element which is positioned in the mounting hole; the PTC heating element is connected to a master control circuit board arranged in the mosquito repelling shell; and the mastercontrol circuit board is connected to a power supply, a mosquito dispeller and a mosquito inducer. The mosquito repelling device mainly utilizes an ultrasonic mosquito repelling generator to repel mosquitoes; and when mosquitoes cannot be repelled indoors, a photocatalyst lamp tube is used for inducing the mosquitoes, and the mosquito killer is utilized for killing the mosquitoes.