The invention discloses a novel mounting and fixing method for a transformer direct-current magnetic bias suppression device, and belongs to the field of direct-current magnetic bias suppression devices. According to the novel mounting and fixing method for the transformer DC magnetic bias suppression device, direct-current magnetic bias generation reasons are mainly divided into three kinds, namely geomagnetic current caused by solar storm, in-ground direct current generated by operation of a direct current power transmission single-pole loop and direct current components generated by an asymmetric load, by building an electric power system model, and the three kinds of reasons are fully considered; the generation probability of direct-current magnetic bias is reduced from the source, economic technical schemes of various methods for inhibiting direct-current magnetic bias are calculated in combination with several methods for inhibiting direct-current magnetic bias, decision makers can compare and select the most suitable transformer equipment, and finally, the transformer equipment is mounted.