The invention discloses a hole cleaning device for a spun-digging pile hole and a construction method thereof. The hole cleaning device comprises a cylindrical hole cleaning device casing pipe with a water filtering hole, a slag extracting pump, a filter screen, a center slag discharge hole, a first slag outlet, a second slag outlet, a compressed gas pipeline, a foaming agent pipeline, a sediment collection chamber, a steel plate, a spring, a rubber sheet, a fastening bolt, a rotating bolt, a compressed gas outlet, a foaming agent outlet, a gas flow dividing body, a blocking device, a filter screen fastening bolt, a round insertion rod, a filter screen rotating bolt, a steel cable, a guide wheel and a fixed shaft. The construction method comprises the following construction steps: 1, arranging the hole cleaning device for the spun-digging pile hole at the end part of a rotary drill rod; 2, inserting the hole cleaning device for the spun-digging pile hole to the bottom of the pile hole and fixing the hole cleaning device for the spun-digging pile hole after rotating the hole cleaning device for the spun-digging pile hole by a plurality of circles at a low speed; 3, inputting compressed gas to the compressed gas pipeline and simultaneously inputting a foaming agent; 4, starting the slag extracting pump to extract slags; 5, repeatedly circulating the operation to complete slag removal, pulling out the hole cleaning device to discharge the slags. The hole cleaning device for the spun-digging pile hole and the construction method thereof have the advantages of low manufacturing and use cost and high slag removing and hole cleaning efficiency and solve the problem of difficulty in removal of the sediments of a mechanical hole and particularly a spun-dug mechanical form.