The utility model discloses a rotary gate lead screw cleaning and maintaining device. Lead screw maintenance field, bottom plate, an outer barrel which is transversely arranged is arranged on the bottom plate; an opening is formed in one side of the outer cylinder; an inner cylinder is transversely arranged in the outer cylinder; the side, close to the opening of the outer cylinder, of the inner cylinder is open. A motor is arranged on the other side of the outer cylinder; an output shaft of the motor is connected with one end of the rotating rod; the other end of the rotating rod penetrates through the side wall of the outer cylinder and is connected with the inner cylinder; a first bearing is arranged between the rotating rod and the side wall of the outer cylinder; a second bearing is arranged between the inner cylinder and the inner wall of the outer cylinder, a long-strip-shaped groove is formed in the inner side wall of the inner cylinder, an inserting groove is formed below thelong-strip-shaped groove, the groove width of the inserting groove is larger than that of the long-strip-shaped groove, an inserting block is arranged in the inserting groove, and a vertical plate isarranged on the upper portion of the inserting block and penetrates the long-strip-shaped groove. The lead screw cleaning device can clean the lead screw conveniently and rapidly, is easy to operate and convenient to use, effectively saves time and improves working efficiency.