The drying buffer tank is matched with high-temperature atmospheric rendering tanks for sealed constant-temperature storage and secondary drying & dehydration. It buffers upstream and downstream processes to enable uninterrupted production line operation. Equipped with internal agitators to prevent caking and guarantee even moisture of materials. Constructed of carbon steel with sealed negative pressure design to stop odor leakage. It temporarily stores dried semi-finished products and conveys them smoothly to oil pressing and crushing sections, upgrading the quality of finished meat-bone meal and animal grease.