The invention discloses a spiral feeding device, comprising a bin cover, a storage bin, a bin body, a spiral rod, an output pipe, a fastening cover, a bearing, a sealing cover, a pressurizing pipe, a rubber cushion, a spraying pipe, sealing cushions and a shaft coupler. The top of the spiral rod is conical; a plurality of material guide grooves are uniformly distributed on the spiral rod; inlets of the material guide grooves are provided with inclined grooves, and outlets of the material guide grooves are provided with annular grooves; the spiral rod is fixed in the bin body through the fastening cover and the bearing, and is sealed through an upper sealing cushion, a lower sealing cushion and the sealing cover; the pressurizing pipe is located at the center of the bin cover, and is in contact with the rubber cushion in the storage bin; a plurality of annular air vents are formed at the non-center position of the middle part of the rubber cushion; and the spraying pipe and the output pipe are symmetrically distributed on the horizontal surfaces of the outlets of the material guide grooves. The powder material output speed is controlled by adjusting the flow of the spraying pipe, the flow of the pressurizing pipe and the rotation speed of the spiral rod.