Low-power-consumption miniature constant temperature device

A low-power-consumption miniature thermostat comprises a base, an outer cover, a heating film and a temperature sensor, the base and the outer cover are made of heat conduction materials, the base and the outer cover are assembled together to form an arc-shaped clamping seat, a clamping groove is formed in the position, located on the periphery of the arc-shaped clamping seat, of the base, and the temperature sensor is arranged in the clamping groove. The heating film is arranged in the clamping groove and attached to the wall of the clamping groove. The base is provided with a slot, and the temperature sensor is inserted into the slot and detects the temperature of the base. The constant-temperature device solves the problem that a traditional constant-temperature device is high in power. The heating film does not need to be in contact with or adhered to the injector by utilizing the good conduction performance of a heat conduction material (aluminum material), and the injector can be randomly mounted and di