The utility model relates to a feeding system device of dangerous wastes. The feeding system device comprises a feeding hopper, a chute, a pressing device, a pushing machine device, a pressure sliding plate, a sliding gate, a hydraulic control system and a related sealing part, wherein the output pressure of a hydraulic cylinder of the pressing device is controlled between 10-25kg, and the wastes in a channel can be compacted; the pushing machine device can push the wastes in the channel into a rotary furnace smoothly; the pressure sliding plate at the front part of the pushing machine device, the sliding gate and the hydraulic cylinder are connected, an adding port of waste agent bottles is added, and the adding of the waste agent bottles is treated by adopting a manual feeding mode; in the whole feeding system of the dangerous wastes, the wastes needing to be treated form an accumulation area, an adding area, a sealing area and a fire stopping area before entering a kiln head, and good sealing is formed by fully utilizing the properties of the materials, so that a series of problems caused by no material sealing are solved and the effect on uniform control of feeding is achieved.