The invention provides a medical moisture-proof cabinet. The medical moisture-proof cabinet comprises a cabinet base fixedly assembled on the bottom and an assembling plate fixedly assembled on a wall, wherein two sliding rods opposite to each other left and right and a screw rod positioned between the two sliding rods are fixedly assembled between the cabinet base and the assembling plate, a cabinet body is assembled on the screw rod, sliding holes are oppositely formed in the left side and the right side of the cabinet body, the sliding holes are matched with the sliding rods, a sliding sleeve is movably assembled on each sliding rod, the upper end surface of each sliding sleeve is fixedly connected with the lower end surface of the cabinet body, a fixing plate is further fixedly assembled between the front end of each sliding sleeve and the bottom end of the cabinet body, a transverse square groove and a vertical square groove communicating with the transverse square groove are formed in each fixing plate, a cabinet plate is assembled in a cabinet cavity in the cabinet body in a vertically moving manner, a rear square groove extending front and back is formed in each sliding sleeve, a movable plate is movably assembled in each rear square groove, a passage channel allowing each sliding rod to pass through is arranged in each corresponding movable plate, the rear end wall of each passage channel is arranged to be a curved surface, and a brake plate is fixedly assembled on each curved surface.