Double-layer outer wall structure for shading outside transformer substation and hiding roof downpipe

The double-layer outer wall structure comprises a main body structure, the main body structure is provided with an inner layer outer wall and an outer layer outer wall, the outer layer outer wall is located on the outer side of the inner layer outer wall in parallel, and a cavity is reserved between the outer layer outer wall and the inner layer outer wall. A cavity is formed in the outer-layer outer wall, a downpipe is arranged in the cavity, the downpipe vertically extends upwards from the ground and penetrates through a roof of the main body structure, an inner-layer window is arranged on the inner-layer outer wall, and a sunshade piece is arranged on the outer-layer outer wall. According to the double-layer outer wall structure for hiding the external sunshade and the roof downpipe of the transformer substation, the external sunshade and the roof downpipe are designed to be hidden into a whole, the uniformity and the attractiveness of building facades are improved while the functions of the external sunsh