Foundation engineering composite pile and pile foundation construction method

The invention provides a foundation engineering composite pile and a pile foundation construction method. The foundation engineering composite pile comprises a pile body, a center steel rod and a hexagonal operating rod, a center groove is formed in the center of the top of the pile body, and the center steel rod is movably arranged in the center groove. The foundation engineering composite pile and the pile foundation construction method are reasonable in design; a plurality of telescopic transverse reinforcing devices are arranged on the pile body, when the center steel rod is rotated, the center steel rod can drive a power screw to rotate through cooperation of a driving bevel gear and a transmission bevel gear, the power screw pushes a movable bearing and a spiral drill bit to move towards the outside of a convex telescopic hole through a movable screw pipe, and meanwhile, the power screw drives the spiral drill bit to rotate through cooperation of a second limiting sliding block and a second limiting sli