The invention provides a portable fixing auxiliary device of a stranded steel wire pulling wire. The portable fixing auxiliary device comprises a left fixing half body and a right fixing half body; the left fixing half body comprises a left arc-shaped groove and an upper tensioning mechanism; the upper tensioning mechanism is installed at the top end of the outer side face of the left arc-shaped groove, and a square plug-in block is fixedly at the bottom end of the outer side face of the left arc-shaped groove; the right fixing half body comprises a right arc-shaped groove and a lower tensioning mechanism, the upper tensioning mechanism is installed at the top end of the outer side face of the right arc-shaped groove, and a plug-in groove being matched with the square plug-in block is fixedly formed in the bottom end of the outer side face of the right arc-shaped groove; two pressing units are installed at the front end of a first pressing arm and the front end of a second pressing arm correspondingly. According to the portable fixing auxiliary device, the structure is simple, and operation is convenient; tensioning and fixing of the stranded steel wire pulling wire can be completed with ease by a worker through the fixing auxiliary device, so that human resources are saved; and tensioning and fixing of a stranded steel wire in an electric pole pulling wire wedge-shaped wire clamp can be smoothly achieved through the upper tensioning mechanism and the lower tensioning mechanism, so that the fixing auxiliary device is beneficial to lowering labor intensity of the worker.