The utility model discloses a main beam supporting platform for a pile foundation test. The main beam supporting platform comprises a supporting table and supporting columns symmetrically arranged onthe two sides of the supporting table. The supporting table comprises a main supporting plate with first sliding grooves in the front side face and the rear side face. A supporting frame is installedon the lower portion of the main supporting plate and comprises a plurality of crossed supporting rods hinged to one another, the crossed supporting rod at the bottommost end is connected with a leadscrew and nut combination, the lead screw and nut combination is driven by a motor, an installation base is arranged on the lower portion of the lead screw and nut combination, and a plurality of height-adjustable supporting legs are arranged at the bottom of the installation base. The supporting column comprises a side supporting plate capable of sliding in the first sliding groove of the main supporting plate, and a worm and gear lifter is installed on the lower portion of the side supporting plate. The supporting platform is large enough in rigidity, strength and stability, adjustable in height, detachable and assembled, and capable of improving the field working efficiency and guaranteeing the safety of field detection.