Automatic balancing main beam for static load test

The utility model discloses an automatic balancing main beam for a static load test. The automatic balancing main beam comprises a box beam main body, an I-shaped guide rail, a sliding block and a lifting lug, the box girder main body is a cuboid box girder formed by welding steel plates; the I-shaped guide rails are welded to the front side and the rear side of the box girder body. An upper group of guide wheels and a lower group of guide wheels are installed outside the sliding block, the sliding block can ride on the I-shaped guide rail to move through the upper group of guide wheels and the lower group of guide wheels so as to adjust the posture of the main beam to enable the main beam to be balanced, a power supply, a servo control system module, a motor and a balance weight are installed inside the sliding block, and the servo control system module is composed of a gyroscope sensor, a single chip microcomputer and a motor driving chip. The lifting lugs are formed by punching steel plates and welded to t