Climbing limiting device of power tongs for oil field pipe

The utility model relates to a climbing limiting device of a power tong for an oil field pipe, which comprises a tong head gear cover, a tong head gear, a limiting pin, a clamping jaw fixing frame and a clamping jaw, and an upper limiting groove and a lower limiting groove are respectively arranged on the circumference of the upper end face of an inner cavity of the tong head gear cover and the circumference of the lower end face of the inner cavity of the tong head gear rotating around the axis. The positions and the angles of the projections of the upper limiting groove and the lower limiting groove on the vertical plane of the axial lead are the same; limiting pins are arranged on the circumference, the same as the limiting grooves, of the clamping jaw fixing frame, and the upper ends and the lower ends of the limiting pins extend into the upper limiting grooves and the lower limiting grooves correspondingly. The power tongs have the advantages that the limiting pin is simply added in the clamping jaw fixi