Combined foundation construction cofferdam

The utility model relates to a combined type foundation construction cofferdam which comprises a cofferdam baffle, a plurality of sets of assembly plates are connected to the two sides of the cofferdam baffle in a clamped mode, the assembly plates are connected in a matched and clamped mode, one sides of the assembly plates are connected with assembly columns matched with the assembly plates in a clamped mode, and the assembly plates are embedded at the top end of a base in a clamped mode. Clamping grooves, grooves, protruding parts and the like are arranged among the assembly plates, the assembly columns and the base so that clamping connection can be tighter, the area of the cofferdam can be increased or decreased according to the requirements of actual on-site conditions, the assembly plates can be clamped on or removed from the changing parts, the structure is stable, installation and disassembly are very convenient, and the structure is simple. The cofferdam has the advantages that the size of the coffer