Steel pipe pile cap structure and construction for improving corrosion resistance of steel pipe pile

The invention discloses a steel pipe pile cap structure which comprises a prefabricated steel pipe pile and a wharf beam. A main reinforcing steel bar is pre-embedded and a core grouted concrete is grouted in the prefabricated steel pipe pile; a stirrup is arranged on the outer side of the main reinforcing steel bar; the wharf beam is formed by a prefabricated cross beam and a prefabricated longitudinal beam; a connector concrete is cast in the longitudinal and cross wharf beams in situ; a prefabricated pile cap and a reinforcing steel bar concrete sleeve pipe are arranged on the top part of the prefabricated steel pipe pile, and are in rigid connection with the prefabricated steel pipe pile through the core grouted concrete in the prefabricated steel pipe pile and a connector concrete ofa cast-in-situ pile cap; a cement gum is blocked in a gap between the periphery of the bottom end of the reinforcing steel bar concrete sleeve pipe and the prefabricated steel pipe pile; a geotechnical cloth layer is wound on