Water heater-air conditioner all-in-one machine and control method and device thereof

The invention discloses a water heater-air conditioner all-in-one machine and a control method and device thereof. The control method is characterized by including detecting water temperature in the water heater-air conditioner all-in-one machine; determining a target operation mode corresponding to the water temperature, wherein the running modes corresponding to different temperatures are stored in the water heater-air conditioner all-in-one machine; controlling the water heater-air conditioner all-in-one machine to run according to the target running mode. The problem of low intelligent degree of the water heater-air conditioner all-in-one machine in the prior art is solved, and the intelligent degree of the water heater-air conditioner all-in-one machine is improved.