Near-water deep foundation pit support structure

The invention belongs to the technical field of support structures, and particularly relates to a near-water deep foundation pit support structure, comprising a waterproof curtain, soil nails penetrating through the waterproof curtain are fixed on a first side slope and a second side slope, pit bottom reinforcing piles are arranged in a foundation pit, and a deep well group is also formed in the foundation pit. According to the support mechanism, deep mixing piles are adopted as the waterproof curtain on the circumference of the periphery of the foundation pit, the side sealing function is achieved, water seepage is prevented, the soil nails are fixed to original soil on the first side slope and the second side slope, to support and reinforce an excavated foundation pit, deformation and damage of the foundation pit support are avoided, pit bottom reinforcing piles are arranged at the bottom of the foundation pit, to reinforce soil at the bottom of the foundation pit, looseness is avoided, and a deep well grou