The utility model discloses an automatic temperature control water adding device of a charging machine. The automatic temperature control water adding device comprises a water tank body; a water supply pipeline and a steam heating pipeline are arranged on one side of the tank body in an upper and lower mode, are in communication with the tank body and are independent of each other; a temperature transmitter, a steam ejector connected with the steam heating pipeline, an upper liquid level switch and a lower liquid level switch are arranged in the tank body, and the upper liquid level switch and the lower liquid level switch are located above and below the water supply pipeline respectively; the front of a water pump on a water discharging pipeline is connected with a water return pipeline, the water return pipe is connected to the water tank body through a throttling valve and an overflow valve, the throttling valve and the overflow valve are connected in parallel, and the rear of a nozzle on the water discharging pipeline is further connected with a compressed air ejector device used for ejecting water of the water discharging pipeline. A water pump water supply and return pipeline device is additionally arranged, so redundant process water instantaneously output by the water supply water pump flows back into a temperature control water tank through the water return pipeline device and then can continue to be recycled rather than being regarded as waste water to be discharged into an underground waste water reclamation pipe network, and therefore process water is saved, and waste is reduced.