Underground structure self-waterproof composite system for basement

The utility model discloses an underground structure self-waterproof composite system for a basement, which comprises a base layer, a waterproof layer arranged above the base layer, a drainage layer arranged above the waterproof layer, a top layer arranged above the drainage layer, a first mounting frame arranged on the outer side of the top layer, a second mounting frame arranged on one side of the first mounting frame, and a side wall arranged on one side of the second mounting frame. A fixing device is arranged between the first mounting rack and the second mounting rack; the fixing device comprises a fixing plate fixed to one side of the first mounting frame, a clamping groove is formed in the other side of the first mounting frame, a plurality of first openings are formed in the fixing plate, telescopic springs are arranged in the first openings, one ends of the telescopic springs are fixedly connected with the first mounting frame, and the other ends of the telescopic springs are connected with the movi