Constant-temperature fermentation room

The invention discloses a constant-temperature fermentation room. The constant-temperature fermentation room comprises a fermentation room body and a hot-air system mounted in the fermentation room body, wherein the hot-air system comprises a blower, a heat exchanger, a steam pipe, a condenser pipe and an exhaust pipe; the blower is mounted on the internal side surface of the fermentation room body and penetrates through the fermentation room body to be communicated with the outside, one end of the heat exchanger is connected with the blower, the other end of the heat exchanger is connected with the exhaust pipe, a heat exchange pipe is arranged in the heat exchanger, one end of the heat exchange pipe is connected with the steam pipe, and the other end of the heat exchange pipe is connected with the condenser pipe; and a temperature sensor and a temperature detect switch are also arranged in the fermentation room body, the temperature detect switch is arranged on the steam pipe, and the temperature sensor is