The invention discloses a loading device for a static load test of a steel structure frame body, and the device comprises force sensors located exactly under the steel structure frame body, and a loading mechanism installed on the steel structure frame body. The device is characterized in that the loading mechanism comprises a loading beam, a distribution beam, hydraulic jacks, active steel pull rods, limiting steel pull rods, a counter-force pedestal, a steel base plate, and a steel sleeve; the loading beam and the distribution beam are connected and fastened at an intersection node through a bolt, thereby enabling the upper part of the loading mechanism to form an integrated body; the loading beam is connected with the counter-force pedestal located at the lower part through four active steel pull rods located at four corners of the loading beam and four limiting steel pull rods located at the central part of the loading beam; a part, at which the loading beam is located, of each active steel pull rod is provided with one hydraulic jack; and the force sensors are respectively disposed under vertical columns at four corners of the steel structure frame body. The device can achieve the loading of a load, can accurately measure the actual loading force of each vertical column, is reliable in force bearing, is simple, is convenient to operate, and is safety in loading.