Steel bar truss shearing mechanism

The utility model discloses a steel bar truss shearing mechanism which comprises a base, supporting rods are installed on the periphery of the top of the base, and a box body is installed on the tops of the supporting rods. A guide rod is longitudinally inserted into the box body in a sliding manner; a fixing block is installed at the bottom of the guide rod, a hook is installed at the bottom of the fixing block, and a truss model is hung below the fixing block through the hook. The angle of the hydraulic cut-off machine can be flexibly adjusted through the handheld hydraulic cut-off machine, all parts of a truss model can be cut off through the handheld hydraulic cut-off machine after the bottom of the truss model leaves the ground and rises to a proper height, and convenience is improved; the angle of the hydraulic cut-off machine can be flexibly adjusted through the handheld hydraulic cut-off machine, all parts of the truss model can be cut off through the handheld hydraulic cut-off machine after the botto