The invention discloses a vehicle, a bio-based composite material air conditioner vent system and a control method thereof, wherein the bio-based composite material air conditioner vent system comprises an air conditioner mist removal vent and a transparence sensor, wherein the air conditioner mist removal vent is made of a bio-based composite material and faces towards the preset position of a vehicle window; the transparence sensor is used for detecting the transparence of the preset position of the vehicle window and sending the detected transparence parameter to a control unit; when the transparence parameter is lower than a preset value, the control unit starts an air conditioner for the vehicle; and the air conditioner for the vehicle blows air to the preset position of the vehicle window through the air conditioner mist removal vent. According to the system, the transparence sensor can be used for automatically detecting the transparence of the preset position of the vehicle window, so that when the transparence decreases, the air conditioner mist removal vent and the air conditioner for the vehicle are started in time to blow air to the preset position so as to perform frost removal and mist removal; the orientation of an air conditioner main vent can not be changed, so that the comfort level of a user can not be reduced; and manual operation of the user is not needed,so that the driving safety can be ensured.