Basement structure and construction method thereof

The invention discloses a basement structure and a construction method thereof. The basement structure comprises a foundation raft, a basement wall and a basement roof. The basement wall body comprises an inner wall body, an outer wall body and a waterproof wall body arranged between the inner wall body and the outer wall body. The inner wall body and the outer wall body are of poured reinforced concrete structures; the waterproof wall bodies comprise a plurality of right-angle waterproof wall bodies and a plurality of vertical waterproof wall bodies; the right-angle waterproof wall bodies and the vertical waterproof wall bodies define the shape of a basement, waterproof belts are arranged between the adjacent vertical waterproof wall bodies, and waterproof belts are arranged between the right-angle waterproof wall bodies and the adjacent vertical waterproof wall bodies. The right-angle waterproof wall body and the vertical waterproof wall body are prefabricated parts; when the basement wall body is poured, t