Automatic fast pipe tongs

The utility model discloses automatic fast pipe tongs which comprise a handle, a movable jaw and a fixed jaw. The movable jaw is arranged in a tong base in a sliding and sleeved mode. The two sides of the top face of the tong base are both provided with a horizontal sliding groove. An open groove is formed in the top face of the tong base. An adjustment sliding block which is fixedly connected to the top face of the rear end of the movable jaw slides along the open groove. Two side folded edges of the adjustment sliding block extend into the horizontal sliding grooves. A hollow cavity is formed in the tong base below the adjustment sliding block. A locked rotation block is arranged in the hollow cavity through a square shaft, the top face and the bottom face of the locked rotation block are both provided with a flange, and each flange comprises a flat surface and an arc surface. A toothed groove is formed in the bottom face of the movable jaw below the adjustment sliding block. The top end of each flange of the locked rotation block extends into the toothed groove, a hinge pin is fixedly connected to the back face of the fixed jaw, the hinge pin sleeved with a compression spring extends into the hollow cavity, the free end of the hinge pin is in contact with the flat surface of the lower flange, and the two sides of the front end of the handle are connected with the two ends of the square shaft respectively.