The utility model provides a small valve case grinds utensil, belongs to grinding or burnishing device technical field. Small valve case grinds utensil includes rotary rod, locking pin, milling cutter, tool -holder cover, cutter removal stop collar, mounting components and adjusting sleeve, rotary rod and locking pin are used for pressing from both sides tight work piece and provide rotary power for the work piece, milling cutter is elasticity grinding sleeve structure, and the suit is in the work piece outside to with interference fit mode and the assembly of tool -holder cover, the inner wall of tool -holder cover be the circular conical surface structure, tool -holder cover left end be equipped with with adjusting sleeve complex screw hole, the tool -holder cover with the clearance -fitmode suit in cutter removal stop collar, the dress is joined in marriage to the mounting components rotary rod, adjusting sleeve right side end is through the screw hole assembly of external screw thread with the tool -holder cover, its right -hand member face and milling cutter contact. The utility model discloses avoided grinding back outer surface of the valve core and the drum type problem has appeared, reached and improved the purpose that the case work piece ground quality and valve seal nature.