The invention relates to a compaction grinding device, in particular to a grinding device for hardware manufacturing. The grinding device for hardware manufacturing is easy to operate, can achieve complete compaction and can quickly grind hardware plates. In order to achieve the technical purposes, the grinding device for hardware manufacturing comprises an n-shaped frame, sliding rails, sliding blocks, a first rack, a first gear, springs, polishing plates, a connecting plate, a second motor, a second gear, a second rack, a first motor, a first rotating shaft, a first belt wheel, a flat belt,a second rotating shaft, a bearing block and a second belt wheel. The sliding rails are symmetrically arranged at the upper end and the lower end of the right side of the n-shaped frame, and the sliding blocks are arranged on the sliding rails. The device has the advantages that the operation is simple, complete compaction is achieved, and the hardware plates can be quickly ground. The device canachieve all-directional complete grinding of the hardware plates and shorten the operation time.