The invention provides an installation device for a large transformer. The installation device for the large transformer stably translates by adequately utilizing clamping between guide rails and rotary wheels of a trolley, so that the whole translation-pushing process is higher in orientation and more labour-saving, and fine movement and location during the translation process can be better controlled due to the use of rotary wheel handles, so that the whole installation process is more effective and more labour-saving. The installation device for the large transformer comprises the guide rails, wherein two rotary wheels are arranged above each guide rail along the direction of the guide rail; the outer diameter of each rotary wheel is provided with an annular groove structure; two rotary wheels are clamped on each guide rail; a support table used for supporting the transformer is arranged on each rotary wheel; a fixing groove used for accommodating each rotary wheel is formed in the lower part of the corresponding support table; each rotary wheel is arranged in the fixing groove of the corresponding support table; each rotary wheel is connected with the corresponding support table through a shaft; each shaft is fixed on the corresponding support table through a bearing; and an operation handle is arranged on one of the shafts connected with each two rotary wheels.