Steel pipe pile cofferdam

The utility model discloses a steel pipe pile cofferdam which comprises a plurality of steel pipe piles, wherein the plurality of steel pipe piles are sequentially connected side by side to define a square or rectangular main cofferdam body, a steel pipe and a connection plate are arranged on each steel pipe pile, and a through groove is axially formed in the side wall of each steel pipe; and the width of each through groove is smaller than that of each connection plate, the steel pipes and the connection plates between every two adjacent steel pipe piles constitute a lock mouth, two arc-shaped limiting plates are arranged at one end of each connection plate, a groove is formed between the two limiting plates, a square or rectangular waling is arranged on the inner side of the main cofferdam body, and reinforced concrete ring beams surrounding a square or rectangle are arranged on the inner side of the bottom of the waling. According to the steel pipe pile cofferdam, seal strips are arranged in the lock mouth