Brewing device for a coffee machine

A making device, comprising a top and bottom swelling the inner part of the swelling cavity. Next to the hollow part comprises for holding the coffee powder component chamber, and making the hollow part comprises a fixed below this of the hollow part sealing of chamber. An on the inner part comprises is provided with a sealing the part, and part is coaxial, and outer part of one motion. Next to the inner part is suitable for fixing to the inner part on the outer part. Of making the cavity of the outer part comprises the operating rod capable of the rotating shaft, and is arranged is connected on swell the inner part of the rod and a driver of centerline eccentric's upper part, thus capable of the operating rod rotating shaft to the inner part of to realize the axial are arranged on outer parts of.