The object of the present invention is a shelter structure, in particular for electrical equipment, totally modular, simple and inexpensive to make, and extremely quick to assemble, also on the place of use. Such structure comprises angular connecting joints (11), horizontal bars (13) and vertical uprights (14) that connect to said joints, and a series of panels (16, 17) of suitable materials suitable for forming the walls, the roof and the floor of the structure.