Universal wrench

The utility model relates to a universal spanner. A clamping groove of a spanner head has two inclined lateral walls which mutually form an intersection angle alpha of 50DEG to 70 DEG. The end surface of a handle which is inside a filling slot of the spanner head is an inclined arc-shaped surface, and teeth are arranged orderly on the handle. The utility model has the advantages of simple structure, reliability for clamping objects which are tightened, flexible fastening operation, convenience, no harm to the objects which are tightened, time saving, and labor saving. As long as the handle is rotated backwards and forwards, the objects which are tightened and are sheathed can be fastened. The utility model can be used as a spanner for fastening screws or nuts, and can also be used as pliers for running water pipes.