The invention mainly discloses a feeding device of a dispensing machine. The feeding device comprises storage frames, wherein semi-finished products are vertically overlapped in each storage frame, the bottom of each storage frame is not sealed, a conveying platform is arranged below the bottom of each storage frame, a rear baffle sheet is arranged between each storage frame and the corresponding conveying platform and is used for supporting against the side surfaces of the semi-finished products, a front baffle block is arranged at the front side surfaces of the semi-finished products, an air cylinder is arranged on the baffle block, the head part of the air cylinder supports against the front side surfaces of the semi-finished products when extending outside, the air cylinder is connected with a pneumatic controller, the semi-finished products are supported without falling when the air cylinder extends outside; when the air cylinder retracts, the semi-finished products freely fall, the air cylinder extends and retracts regularly, the number of the semi-finished products falling on a conveyor belt in unit time is a constant value, and the position is fixed below the storage frame, and thus the problems of speed and deviation of a station during manual discharging are avoided.