To improve the defrosting process of cold storage, a defrosting device with an intelligent detection function is proposed. Through the setting of the lifting mechanism, the up and down movement of the mobile shell can be realized, and then the use height of the ventilation pipe can be adjusted according to the actual situation, making the use more flexible. Through the cooperation among the mobile shell, opening, fan, ventilation pipe, water-passing ring, heat-conducting water pipe, water tank, pump body, water suction pipe, water outlet pipe, water return pipe and heating rod, the air in the ventilation pipe can be better heated, with good heating efficiency and excellent defrosting effect. Among them, the wind pressure sensor and temperature sensor can monitor the temperature and wind pressure in the ventilation pipe in real time. When the temperature is too high or the wind pressure is too large, the controller can adjust the heating temperature and air intake, thus ensuring the defrosting effect, saving electricity costs and improving the intelligent control level of the cold storage.