Bit grinding machine

The utility model relates to a bit grinding machine which comprises a machine frame, a motor and a grinding wheel. The bit grinding machine is characterized in that the fore-and-aft advancing and retreating motion of a movable flat plate can be completed by a leading screw, a nut, a guide pillar and a guide sleeve mechanism, and the luffing of the movable flat plate is controlled by a four-bar mechanism; a flat plate turning horizontally is arranged on the movable flat plate, and a drill clamp and a locating piece are arranged on the flat plate; after fixed on the drill clamp, a bit is arranged on the locating piece; thus the cutting edge of the bit can be ground. The bit grinding machine can complete the grinding work of bits with different peak angles, back angles and chisel edges. The bit grinding machine provides conditions for people to repair guide ways in the field.