The invention discloses string ball pliers used for spinning equipment. The string ball pliers can effectively eliminate potential safety hazards caused when string balls are manually replaced. The string ball pliers comprise two plier legs, two connecting rods which are arranged in an intersected mode, locking handles and a locking nut, wherein the locking handles are arranged on the upper side and the lower side of the intersecting position of the two connecting rods respectively. The plier legs are sequentially provided with plier openings, first hinged holes and second hinged holes in the length direction, the plier openings are bent inwards, and the second hinged holes are long holes which extend in the length direction of the plier legs; the front end of each connecting rod is hinged into the first hinged hole in one plier leg, and the rear end of each connecting rod is hinged into the second hinged hole in the other plier leg and can slide along the second hinged hole; screws are arranged on the locking handles, penetrate through the intersecting position of the two connecting rods and then are connected with the locking nut, and the locking nut is fixed to the adjacent connecting rod.