The invention provides a duvet including a quilt cover. After the quilt cover is symmetrically folded, the quilt cover is sewn together through needles and threads, the four sides of the upper surfaceof the quilt cover and the four sides of the lower surface of the quilt cover are sewn together through needles and threads, and a cavity is formed internally. The cavity is penetrated by needles andthreads from the upper surface of the quilt cover to the lower surface to form a plurality of square compartments, the end sides of the square compartments are provided with down filling ports, and the square compartments are longitudinally communicated through the down filling ports. By arrangement of a double-layer fabric, the down leakage caused by scratching can be effectively avoided, and the service life of the duvet is prolonged. Through the novel down filling method, the down filling can be more uniform, and the down filling efficiency of the duvet is greatly improved.