The invention discloses a curved cavity independent down filling tank comprising a double-layer down locking structure and a down jacket with the same. The curved cavity independent down filling tank comprises a tank body, a down filling opening, a zipper, a down locking blocking piece, a curved down filling cavity, down conveying through holes and a bevel closed door; the down filling opening is formed in the surface of the tank body; the zipper is arranged on the surface of the down filling opening; the down locking blocking piece is fixed on the inner side of the down filling opening; the curved down filling cavity is formed inside the tank body; the down conveying through holes are alternately formed in the curved down filling cavity; the bevel closed door is arranged at the position of the down conveying through holes in an inclined mode. According to the curved cavity independent down filling tank comprising the double-layer down locking structure, the low cost, the high efficiency, the long service life and the independent down filling are implemented, the service life of the tank is extended, the heat preservation effect is improved, the comfort level is enhanced, the down filling efficiency is improved, and the production cost is reduced.