Complex stratum diaphragm wall construction method

The invention relates to a complex stratum diaphragm wall construction method, which belongs to the technical field of diaphragm wall construction, and is characterized in that specially designed square pipe piles are used for construction, and the construction mainly comprises the following steps: driving a group of hollow square pile pipes into a diaphragm wall construction area one by one; and along the construction design route of the diaphragm wall, pipe sinking construction of the next set of square pile pipes is conducted, the pile pipes are pulled out one by one from one side, a diaphragm wall pouring area is formed, concrete is poured after the prefabricated reinforcement cage is sunk into the pouring area, and a reinforced concrete wall body is formed. The square pipe piles are driven into a construction area of the underground diaphragm wall one by one, the underground diaphragm wall construction groove is generated through extrusion of the pipe piles on the stratum, the stratum density on the two