The utility model relates to a steel protects positioner of a section of thick bamboo in pile foundation construction includes: locate the pile foundation and set for the location axle of position department, location position of axle in the center of pile foundation department, the length of pole adjust so that to adjust the length of pole consistent with the radius that the steel protected a section of thick bamboo to the regulation pole of adjustable length, adjusts the first end of pole and rotationally connects in the location axle, and the vessel of second end relative with first end onadjusting the pole sets firmly, and holding underlined material in the vessel, the through -hole that supplies the mark material to leak is offered to the bottom of vessel, round a location axle swivelling adjustment lever, and then drives the vessel and rotates together, protects the position of a section of thick bamboo in the peripheral location tapping of location axle through the mark material that leaks. The utility model discloses the orbit of mark material mark is clear, and the use can be had enough to meet the need to the location accuracy, is applicable to not unidimensional steel and protects a section of thick bamboo.