The invention relates to a bored cast-in-place 
pile suitable for 
karst areas with 
connectivity channels and a 
pile forming method thereof. The bored cast-in-place 
pile comprises a pile body and a wrapping piece, wherein the pile body at least comprises a concrete pile body and a reinforcing cage, the wrapping piece is a composite 
geotextile with a closed bottom and an open top, the wrapping piececoats the reinforcing cage before the pile body is formed into the pile, the wrapping piece is arranged around and lightly buckled on the reinforcing cage through an annular iron wire, concrete groutis injected into the reinforcing cage under 
high pressure, the high-pressure concrete 
grout pushes part of the wrapping piece to bulge towards the 
connectivity channels to form a dendritic structure in a 
branch-like form, and the pile is formed after the 
grout is solidified and hardened; and the 
diameter of the wrapping piece is larger than the 
diameter of the reinforcing cage, and the length of the wrapping piece is larger than the length of the reinforcing cage. The bored cast-in-place pile is provided with the wrapping piece to wrap 
grout, so that the phenomena of grout leakage, 
diameter shrinkage and the like in the process of manufacturing the bored cast-in-place pile in the 
karst areas are avoided, the pile forming quality is effectively guaranteed, the integrity of the pile and 
karst with the 
connectivity channels is improved, and the 
bearing capacity of the pile is greatly improved.