Special opening spanner for sucker rod

The utility model relates to a special opening spanner for a sucker rod, which is applied to a special auxiliary tool during sucker rod removal in underground operation. A four-opening end and a three-opening end are formed by cutting a rectangular steel plate, the thickness of the steel plate is between 12mm and 24mm, both ends of a middle connecting section are respectively fixed with the four-opening end and the three-opening end, both sides of the four-opening end are respectively provided with two square notches, one side of the three-opening end is provided with a notch with the edge length being 49mm to 51mm, the other side of the three-opening end is provided with two square notches, and the edge lengths of the two notches are respectively between 21mm and 23mm and between 34mm and 36mm. The special opening spanner has the beneficial effects that the sucker rod can be tightly clamped, the back-up tong function of hydraulic tongs can be replaced when the sucker rod is stripping and the square diameter