Auxiliary telescopic device for oil filling pipe or urea filling pipe

The auxiliary telescopic device comprises a support, a pulley assembly, a roller assembly and a pin shaft assembly, the support is a U-shaped support, the pulley assembly is installed at an opening of a U-shaped groove of the support, the roller assembly is installed at the top end of the U-shaped groove of the support, and the pin shaft assembly is installed at the top end of the U-shaped groove of the support. Two integrally-formed supporting legs are arranged at the top end of the support, the pin shaft assembly is installed on the supporting legs at the top end of the support, and the pin shaft assembly is connected with the movable end of a wire puller on the oiling machine. Relative sliding between the oil filling pipe/urea filling pipe and the support is achieved through the movable pulley, bending abrasion of an internal pipeline is avoided, abrasion between the surface of the oil filling pipe/urea filling pipe and the support is further reduced, and the service life of the oil filling pipe/urea filli