The utility model relates to a protection brittle material's grinding machine frock relates to the machinery processing technology field, including preceding clamp splice, back clamp splice, a spring,a screw, preceding clamp splice is parallel to each other with the back clamp splice, preceding clamp splice do not is equipped with near the punishment of both ends tip position and runs through thethrough -hole of its lengthwise to relative both sides wall, back clamp splice runs through the through -hole of its lengthwise to relative both sides wall also being equipped with respectively withtwo through -holes of preceding clamp splice corresponding positions, the through -hole of the corresponding position of clamp splice department around two screws pass respectively, still be furnishedwith on every screw and lock the nut on two screws side by side with the front and back clamp splice, article two, the spring overlaps respectively at the screw rod surface between the clamp splice around two screws are located, be connected with the locating pin on the inside wall of clamp splice or back clamp splice in the front. This frock can be fine the abrasive machining of solution brittlematerial part, can prevent that the emery wheel from rolling to produce simultaneously again bursts apart.