The invention discloses a feed storage device capable of prolonging storage time. The feed storage device comprises a storage box, and a division plate is arranged in the storage box. The storage box is divided into two same upper and lower boxes by the division plate, and a plurality of hourglass-shaped material storage chambers are arranged in each box in order from left to right. The storage box can rotate around the horizontal axis of the storage box, and the two ends of the storage box are connected with supports. The space between the chamber walls of the middle narrowest point of each hourglass-shaped material storage chamber is 5-10cm. Stirring pieces are arranged on the top surface and the bottom surface of each material storage chamber, and the stirring pieces can do left and right turnover movement. By rotating the storage box, materials can constantly move and turn over in the hourglass-shaped material storage chambers during storage, and therefore moisture in the materials can be expelled during turnover so as to be prevented from accumulating in the materials to cause fermentation. The storage quality of materials is improved, and the economic loss is avoided.