Prefabricated dewatering square pile and underground side wall steel plate laminated structure system

The utility model relates to a prefabricated dewatering square pile and underground side wall steel plate superposed structure system which comprises a hollow square pile and a structural side wall, steel plates are embedded in the surfaces of the upper end and the lower end of the hollow square pile and the structural side wall respectively, bolt hole channels are formed in the steel plates, and through holes corresponding to the bolt hole channels are formed in a pile body of the hollow square pile and the structural side wall respectively. The hollow square pile and the structural side wall are fixed at the position of the steel plate through bolt hole channels and prestressed steel bars connected in the through holes, and gaps between the hollow square pile and the structural side wall are fixed through grouting. The utility model provides a prefabricated hollow square pile which is also used as a dewatering well, and is connected with a prefabricated underground space structure side wall to form a lamina