The invention discloses a machining device for workpiece compressing and cutting. The machining device comprises a large fixed base; at least three fixed compressing seats are mounted at the end of the left side of the fixed base and are located in the same vertical direction, and distances between the adjacent fixed compressing seats are the same; the machining device is high in work efficiency, a plurality of moving compressing seats are arranged in the transverse direction of each fixed compressing seat, and during compressing, all the compressing seats in front of the last one moving compressing seat are extruded only through compressing of the last one moving compressing seat; a plurality of fixed compressing seats are arranged in the vertical direction of the fixed compressing seats as well, and through cooperation, a plurality of workpieces can be compressed; a cantilever type cutting device is arranged between every two sliding grooves, and after compressing, the workpieces can be cut; and the device is suitable for large-scale compressing and cutting work, and achieves the industrialization aim.