Stabilizing support for large steel pipe machining

The utility model relates to the technical field of steel pipe machining, in particular to a stable support for large steel pipe machining, which comprises a feeding screw, a clamping block, a pressing block and a sliding rod, and has the advantages that a bidirectional threaded rod is arranged, the feeding screw and a starting motor are arranged, and two moving blocks move oppositely or oppositely; a steel pipe needing to be fixed is fixed to a clamping block at the upper end of a connecting block, a telescopic air cylinder is started, the clamping block at the lower end of a lower pressing block moves, a sliding rod at the lower end of the lower pressing block drives a sliding block to move towards the middle, and the clamping blocks at the two ends move towards the middle; the clamping blocks in the three directions move towards the clamping blocks at the lower end, the steel pipes are clamped through the formed clamping grooves, clamping is conducted in the four directions, the clamping stability is enhan