The utility model provides a subsidence-reducing pile structure of a capped steel pipe of an immersed tunnel. The main structure comprises a plurality of steel pipe piles; a steel pipe cap is arranged at the top of each steel pipe pile; earth among the piles is filled among the plurality of steel pipe piles and the steel pipe caps; a broken stone hardcore is paved on a plane formed by the earth among the piles and the steel pipe caps; the immersed tunnel is arranged above the broken stone hardcore; and backfilling layers are arranged at the two sides and the top face of the immersed tunnel. According to the subsidence-reducing pile structure disclosed by the utility model, load sharing among the steel pipe piles and the earth among the piles is adjusted through the broken stone hardcore so as to guarantee the uniform subsidence of a pipe bottom. The penetrating amount of pile tops to the broken stone hardcore can be reduced through arrangement of the steel pipe caps, the stress concentration of the top face of the broken stone hardcore is reduced, the after-construction subsidence is effectively controlled, a load bearing property of the earth among the piles and the capped files is expressed, an earth body can bear 20-40% of the load and the subsidence is reduced by 30-50%, so that the subsidence-reducing pile structure has a good application prospect in foundation treatment of a deep sea (water) soft earth immersed tunnel.