Exterior wall structure of multilayered basement and construction method thereof

The invention provides an exterior wall structure of multilayered basement and a construction method thereof. The exterior wall structure comprises an exterior wall of a bottom basement, a supportingpile, a top plate of the bottom basement and an exterior wall of an upper basement. The supporting pile is arranged on the outer side of the exterior wall of the bottom basement, and a crown beam is poured on the top of the supporting pile; the top plate of the bottom basement is formed on the top of the exterior wall of the bottom basement, and the top plate of the bottom basement stretches to the crown beam and is connected to the crown beam integrally; and the exterior wall of the upper basement is formed on the crown beam and is connected to the crown beam integrally. The exterior wall structure provided by the invention solves the problems that the construction time of a conventional multilayered basement is long and the utilization ratio of a crown beam supporting structure is low. 本发明提供了种多层地下室的外墙结构及其施工方式，该外