The invention discloses a support and pipe rack structure integrated system and a construction method, and the problems that in the prior art, an operating space between a fender pile and a basement exterior wall is large, the excavation and backfilling workload is large, and the stiffness of the fender pile cannot be fully utilized are solved. The effects of reducing the excavation and backfilling workload, fulling utilizing the lateral and vertical stiffness of an enclosing structure, reducing working procedures, shortening the construction period and reducing the cost can be achieved. According to the technical scheme, the support and pipe rack structure integrated system comprises the fender pile, and the fender pile also serves as a permanent external wall structure of a pipe rack tobe used for bearing the water-soil pressure and overlying filled load of the using stage; the top of the fender pile is provided with a top pressing beam, one side of the top pressing beam is providedwith a girder used for supporting, a top plate is connected to the tops of the top pressing beam and the girder in an overlapped manner, and the top plate and the external wall structure are used forforming a whole through a casting bracket beam; and a pilaster is connected to the bottom of the bracket beam, a bottom plate is connected to the lower end of the pilaster, and the surface of the topplate, the surface of the bottom plate, the surface of the bracket beam and the surface of the pilaster are each provided with a waterproof layer and a protecting layer from inside to outside.