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This utility model provides a novel rotary drum dryer, relating to the technical field of rotary drum dryers. It includes a dryer body, with a discharge port fixedly connected to the outer surface of the dryer body. A support frame is also fixedly connected to the outer surface of the dryer body. One end of the support frame has a sliding groove, and a movable block is fitted onto the inner wall of the sliding groove. A movable plate is fixedly connected to one side of the movable block. A fixed rod is fixedly connected to the outer surface of the support frame, and a first support plate is fixedly connected to one end of the fixed rod. A sliding rod is fitted onto the inner wall of the support frame. In this utility model, the dried feed is discharged through the discharge port. The sliding rod moves the movable support plate, bringing it closer to the first support plate. This facilitates the worker placing the feed bag onto the movable support plate and the first support plate. Then, the spring's return causes the movable support plate to move, widening the opening of the feed bag, allowing the feed to enter the bag normally during discharge.