The invention relates to a constant temperature cleaning kettle with a humidity monitoring function. The constant temperature cleaning kettle with the humidity monitoring function comprises a top cover with threads, a switch key, a handle, a power line, a constant temperature module circuit board, a stainless steel heating board, an adjustable nozzle, a kettle opening, a power indication lamp and a humidity meter; the top cover with threads is arranged at the top of the cleaning kettle body; the switch key is embedded into the handle integrally formed with the kettle body; the stainless steel heating board is arranged in the cleaning kettle body and is connected onto the constant temperature module circuit board by a lead; the constant temperature module circuit board is embedded in the cleaning kettle body; the adjustable nozzle is arranged on the kettle opening; the power line is connected with the constant temperature module circuit board; the power indication lamp is embedded and mounted into the cleaning kettle body; the humidity meter is arranged at the side surface of the cleaning kettle body. The constant temperature cleaning kettle with the humidity monitoring function is water-saving when being used, the cleaning cost is low, the use is convenient, the cleaning effect is good and the temperature is adjustable.