The utility model discloses the shortcoming of being under construction is welded by the transformer substation to the assembled steel construction, provides a detachable steel bar truss connection structure of assembled transformer substation, including steel column, girder steel, interior side fascia and steel bar truss building carrier plate, the steel column lower extreme is fixed on the basis, steel column and girder steel between is connected fixedly through T shape connecting plate and rectangle connecting plate, and the upper and lower direction of girder steel all is equipped with theT connecting plate that appears, T shape connecting plate wholly become T shape structure, T shape connecting plate one end directly through the screw fixation in the side of steel column, the otherend and girder steel pass through the fix with screw. This assembled steel construction transformer substation passes through the bolt and with the structrual joint, replaces traditional welding process, has reduced the influence of work progress to becoming the power station structure performance, has improved the tolerable error rate of work progress, has reduced construction cost.