Sheet metal part bending machine

The utility model discloses a sheet metal part bending machine which comprises a workbench, a support is arranged on the workbench, a hydraulic cylinder is arranged on the support, a connecting base is arranged at the output end of the hydraulic cylinder, a T-shaped block is movably installed in the connecting base, an upper die is arranged at the bottom end of the T-shaped block, a compression spring is arranged in the T-shaped block, and locating pins are arranged at the two ends of the compression spring. The two positioning pins are inserted into the connecting bases correspondingly, a positioning pedestal is arranged on the workbench, a forward and reverse screw is rotationally installed in the positioning pedestal, a crank handle is arranged at one end of the forward and reverse screw, the forward and reverse screw is in threaded connection with a first sliding block and a second sliding block correspondingly, and connecting rods are rotationally installed on the first sliding block and the second slidi