Abstract: Disclosed is a coffee powder compressing device for a coffee maker, comprising an accommodating chamber (11a); a filter assembly (17); a movable pressing block (5); a first sealing ring (6); and a brewing chamber (B) formed by the first sealing ring (6), the movable pressing block (5) and the filter assembly (17); an extrusion portion (5a) being disposed on the lower end of the movable pressing block (5), when the movable pressing block (5) is situated at the second position and the filter assembly (17) is located into the accommodating chamber (11a), the extrusion portion (5a) inserts into the cavity (12a); thereby, by means of compressing the coffee powder through the extrusion portion (5a), solving the problem that the tightness of the compressed coffee powder is difficult to be controlled and the laborious problem in the existing coffee powder pre-compressing methods.