The invention discloses a medical drying box. The medical drying box comprises a shell and supporting plates. A humidity sensor is arranged at the left end of the top of an inner cavity of the shell. An ultraviolet lamp tube is arranged at the right end of the outer surface of the humidity sensor. A rotary shaft is arranged in the middle of the bottom of the inner cavity of the shell. A supporting rod is connected to the inner surface of the rotary shaft. The supporting plates are arranged on the outer surface of the supporting rod. A movable door is connected to the left side of the outer surface of the shell through a hinge. A handle is arranged on the outer surface of the movable door. Supporting legs are arranged at the bottom of the outer surface of the shell. An air heater is arranged at the bottom of the right side of the outer surface of the shell and connected with a circulating fan through a pipeline, and the circulating fan is arranged at the left end of the top of the outer surface of the shell. According to the medial drying box, the circulating fan is arranged and connected with the air heater through the pipeline, so that the circulating rate of heat in the shell is increased, and the medical instrument drying time is shortened; and meanwhile, the heat utilization rate is increased, and waste of electric energy is reduced.