Stability maintaining system for bored pile construction and construction method thereof

The invention provides a stability maintaining system for bored pile construction and a construction method thereof. The stability maintaining system for drilling pile construction comprises a pile casing and a soil layer reinforcing assembly. The pile casing and the soil layer reinforcing assembly extend in the vertical direction, the soil layer reinforcing assembly surrounds the radial outer side of the pile casing, and a limiting space is formed between the soil layer reinforcing assembly and the pile casing; the soil layer reinforcing assembly comprises a plurality of reinforcing pieces arranged in the circumferential direction of the pile casing, and all the reinforcing pieces extend in the vertical direction. According to the stability maintaining system for drilling pile construction, usability can be improved, construction efficiency is improved, construction cost is reduced, a thickened steel casing does not need to be specially manufactured, and waste of concrete can be reduced when the steel casing