STRUCTURAL COLUMN AND MODULAR STRUCTURE FOR ELECTRICAL CABINETS COMPRISING SAID STRUCTURAL COLUMN, includes a structural column (1) which, from a single piece, accurately determines two corners or vertexes of a modular structure (19) for electric cabinets. The modular structure (19) has four vertically positioned structural columns (1) and at least eight horizontal beams (20) connected to each other by means of screws (21). This invention also introduces an innovative joint between the elements of the structural columns (1), which are joined together by means of welds (6) and with the aid of limiters (12), positioning flaps (11) and engagers (9). Thus, this invention guarantees a perfect square of the modular structure and the correct assembly of the electrical cabinet, with no need for highly specialized labor. The modular structure (19) presented here can be manufactured entirely from low-cost metal materials such as carbon steel, significantly reducing the manufacturing costs of electrical cabinets.