The invention discloses an electric heater device of a heat pump-type air conditioner, which mainly comprises an electric heater, a controller and a blower, wherein the controller comprises a triode and a plurality of four-pin relays; the individual speed shifts of the blower and the electric heater are connected with the pins of the controlled ends of the relays respectively, and the other pins of the controlled ends of the relays are connected with an AC220 power source; the pins of the control ends of the relays for controlling the individual speed shifts of the blower are grounded, and the other pins of the control ends of the relays are connected with a relay driver; one pin of the control end of the relay for controlling the electric heater is connected to the relay driver for controlling the individual speed shifts of the blower, and the other pin of the control end of the relay for controlling the electric heater is connected to the collector electrode of the triode; and the base electrode of the triode is connected with an electric heating controller, and the emitter electrode of the triode is grounded. The electric heater device provides the double protection in terms of software logics and hardware to ensure that the operation of the blower is the precedent condition of operation of the electric heater, eliminates the possibility of dry burning of the electric heater and enables an air conditioner to work more safely.