Closed-loop heating system for sterilizing mushroom culture medium

A closed-loop heating system for mushroom culture medium sterilization comprises a horizontal heating tank and a circulating pipeline, the heating tank is used for containing a to-be-heated culture medium and provided with a hollow interlayer, and the two ends of the circulating pipeline are communicated with the two ends of the hollow interlayer. A plurality of electric heating wires and an air inducing assembly capable of controlling air in the circulating pipeline to flow into the hollow interlayer are arranged in the circulating pipeline. The two ends of the circulating pipeline are communicated with the two ends of the hollow interlayer, so that a loop allowing air to circularly flow is formed, and after a culture medium is placed in the heating tank, the air inducing assembly in the circulating pipeline is matched with the electric heating wire to extract air in the hollow interlayer for heating; and after being heated, the culture medium can be fed into the hollow interlayer, so that the heated gas can