The invention discloses a supporting device for installing an iron yoke on a transformer. The supporting device comprises a storage panel and a height adjustable support frame, wherein the storage panel stretches over a transformer body and is used for placing an upper iron yoke silicon steel sheet; the height adjustable support frame is installed at the bottom of two ends, in the direction of long axis, of the storage panel, and is vertically arranged on two sides of the transformer body; the support frame is of a withdrawing telescopic structure; and pin holes for positioning are distributed on the support frame along the vertical direction. According to the supporting device for installing the iron yoke on the transformer provided by the invention, operators directly face the supporting device, the upper iron yoke silicon steel sheet is directly installed in place, and the supporting device can be used for the installation of an upper iron yoke in the device body assembling of various products. The quantity of the operators when the upper iron yoke is installed is reduced through the supporting device, the operation is convenient, the efficiency is promoted, the operation method is improved, the fatigued work of the operators is eased, the misoperation during operation is avoided, and the quality of the product is improved.