The invention relates to an improved structure of a tablet press feeding device. The improved structure comprises a feeding hopper. Fixed blocks are arranged on the outer wall of the feed end of the feeding hopper. Driven blocks are hinged to connection rods II arranged at the upper ends of the fixed blocks through connection rods I arranged at one ends of the driven blocks. Spray nozzles are arranged at the other ends of the driven blocks, the spraying ends of the spray nozzles are matched with the side wall of the feeding hopper, and water inlet pipes are arranged on the spray nozzles. Valves I are arranged on the water inlet pipes, air inlet pipes are connected to the water inlet pipes, and valves II are arranged on the air inlet pipes. Pressurizing valves are arranged at positions, between the air inlet pipes and the spray nozzles, on the water inlet pipes. The valves I, the valves II and the pressurizing valves are controlled by a controller arranged on the outer wall of the feeding hopper. The improved structure has the advantages that the rotatable spray nozzles are connected with the water inlet pipes and the air inlet pipes, so that automatic washing and drying of the inner wall of the feeding hopper are realized, simplicity and convenience in operation are also achieved and troublesome problems in cleaning of the inner wall of the feeding hopper are avoided.