The utility model relates to an abrasionproof cover of knife rest subassembly, abrasionproof cover has at least two and is the regional wallboard portion section in surface angle setting, that be used for hiding the knife rest subassembly each other, and wherein the section interconnect of these wallboard portions becomes integrative to these abrasionproof cover constitute for metal founding spare or metal forging spare. The life of knife rest subassembly can obviously be improved with the help of this kind of abrasionproof cover to reduce machine down time.