The invention discloses a grinding restoration structure and method for a seal face of a slurry valve or a discharging valve. A current method for grinding restoration of the seal face of the valve anytime is high in machining cost of restoration structure and complex in operation before grinding restoration. The grinding restoration structure and method are characterized in that a guide part is fixedly connected to a valve rod between two support sheets and can clamp an anti-rotation block used in fit with the inner side walls of the support sheets; a gearbox is fixedly connected to the tops of the two support sheets, and a pair of mutually engaged tapered gears are arranged in the gearbox; a driven tapered gear is fixedly connected with a valve rod nut arranged on the valve rod in a sleeving mode, the lower portion of the valve rod nut is disposed outside the gearbox, and the outer side wall of the valve rod nut can clamp the anti-rotation block; the valve rod is connected with a locking spanner arranged on the valve rod in a sleeving mode through a thread; the top of the valve rod is fixedly connected with a grinding spanner. The restoration structure is reasonable and low in machining cost; the operation before grinding restoration is convenient, and restoration is facilitated.