The invention discloses a stamping device for hardware fitting machining and a using method. The stamping device comprises a machining table, a stamping groove and a pressing device, wherein the stamping groove is formed in the surface of the machining table, the pressing device is arranged at the position, located above the stamping groove, of the top of the machining table, inner die plates aresymmetrically arranged in the stamping groove, the inner die plates are elastically and rotationally connected with the inner wall of the stamping groove through torsion springs, touch mechanisms forelastically stretch-out and draw-back touch are arranged at the positions, corresponding to the inner die plates, of the bottom of the machining table, a feeding mechanism for rolling extruding guiding is arranged on the side, away from the pressing device, of the top of the machining table, and a cutting mechanism for pneumatic quick punching is arranged at the end of the feeding mechanism. According to the stamping device for hardware fitting machining, an annular pressing mode is adopted, and the inner die plates capable of movable rotating are matched, so that the annular extrusion is carried out on a steel belt, tight annular wrapping is guaranteed, and the one-step forming effect is achieved; and meanwhile, a linkage mechanism is triggered, so that the whole machining process is coherent, and the machining efficiency and the machining precision are improved.