Control method and control device of vehicle-mounted air conditioner, vehicle-mounted air conditioner and vehicle

The invention provides a control method and device of a vehicle-mounted air conditioner, the vehicle-mounted air conditioner and a vehicle, the vehicle-mounted air conditioner is installed in a loading space of the vehicle, and the loading space is used for containing animals; the method comprises the following steps: acquiring target biological characteristics in a vehicle; determining that the target biological feature is matched with a pre-stored biological feature, and calling an environment adjustment strategy corresponding to the pre-stored biological feature; and adjusting the environment in the vehicle according to the environment adjustment strategy. According to the method, the target biological characteristics in the vehicle are obtained and matched with the pre-stored biological characteristics pre-stored in the vehicle-mounted air conditioner, after matching is determined, the environment adjusting strategy matched with the pre-stored biological characteristics is called, the environment adjustin