Automatic telescopic guide frame for lowering large-diameter pile foundation steel casing

The utility model discloses an automatic telescopic guide frame for lowering a large-diameter pile foundation steel casing, which comprises a guide frame main body, an upper frame body and a lower frame body are arranged on the guide frame main body, a support connecting frame is connected between the upper frame body and the lower frame body, and fourth reinforcing sheets are uniformly arranged in the middle of two sides of the upper frame body and the lower frame body. The upper frame body and the lower frame body are the same in structure, positioning plates are welded to the upper end of the upper frame body and the upper end of the lower frame body, a groove is formed in the lower end of each positioning plate, a guide plate is movably inserted into the groove in the lower end of each positioning plate, a mounting plate is further arranged on each guide plate, and a hydraulic cylinder is mounted at the upper end of each mounting plate. According to the automatic telescopic guide frame for lowering the la