Counter-force tool for tightening axle assembly spindle head nut

The utility model relates to a counter-force tool for tightening a shaft head nut of an axle assembly. The counter-force tool comprises a tightening gun, the telescopic frame comprises a first end and a second end which can stretch out and draw back mutually, the first end of the telescopic frame is connected with the tightening gun, and the second end of the telescopic frame extends outwards along the axis of the tightening shaft; the clamping device is fixed to the second end of the telescopic frame and used for clamping an axle assembly, the clamping device comprises two clamping pieces which are oppositely arranged, and each clamping piece comprises a positioning seat fixed to the second end of the telescopic frame and a clamping piece which is fixed to the second end of the telescopic frame; one end of the hanging plate is hung on the positioning seat; the clamping counter-force plate is arranged on the inner side of the hanging plate and is positioned below the positioning seat; and the linear driving m