A physical experiment device comprises a first supporting rod, a fish eye bearing, a pin, a first bearing, a first electric push rod, a support plate, a slide block, a guiderail, a first wheel carrier, a bull gear, a rotating shaft, a third motor, a fourth motor, second mixing blades, a second electric push rod, a lower barrel body, supporting legs, a base board, a sixth motor, a second bearing, a controller, a fifth motor, a scraper, first mixing blades, a frame, an upper barrel body, a first motor, a second cylinder, a pinion, a second supporting rod, a second motor, a first cylinder and a second wheel rack. The frame is mounted on the base board. The first motor is mounted on the frame. The second cylinder is mounted on the output shaft of the first motor. The second supporting rod is mounted on the second cylinder. The first cylinder is mounted on the second supporting rod. The physical experiment device has a function of scraping the material which adheres to the barrel wall.