Telescopic supporting leg for jacking mechanism

The utility model belongs to the technical field of jacking equipment, and particularly relates to a telescopic supporting leg for a jacking mechanism, which comprises a multi-stage oil cylinder and a multi-stage sheath, the multi-stage oil cylinder comprises a primary oil cylinder, a plurality of middle oil cylinders, a final-stage oil cylinder and an oil cylinder body; the primary oil cylinder is slidably sleeved with the primary middle oil cylinder, the middle oil cylinders are slidably sleeved step by step, the final middle oil cylinder is slidably sleeved with the final oil cylinder, and the final oil cylinder is slidably sleeved with the oil cylinder body. The multi-stage sheath comprises a primary sheath, a plurality of middle sheaths, a final-stage sheath and a sheath base; the sheath base and the primary oil cylinder, the primary sheath and the oil cylinder body, the final-stage sheath and the primary middle oil cylinder, the multiple middle sheaths and the multiple middle oil cylinders, and the prim