The invention provides an auxiliary wire winding device of an oil-immersed type transformer, aiming at solving the problem that a lead wire is easy to loosen when a transformer coil is wound. A guide rod is arranged at the upper part of a base; a slide block is slidingly mounted on the guide rod; a pair of supports are arranged on each of the left and right sides of the base; chain wheels are rotatably mounted on the paired supports and a chain is arranged between the two chain wheels; the slide block is fixedly connected with the chain; a driven gear is fixed on a chain wheel shaft of each chain wheel; a first motor is fixedly arranged on the base and a driving gear is arranged at the output end of the first motor; a platform is fixed at the top of the slide block; a rotary table is rotatably mounted on the platform; a T-shaped bracket is fixed on the rotary table; jacking assemblies are arranged at the two ends of the bracket respectively; and ejection plates on the jacking assemblies are in contact with the lead wire all the time and eject the lead wire. The auxiliary wire winding device of the oil-immersed type transformer can be used for jacking the lead wire and can prevent the lead wire from loosening in a wire winding process.