With the pre-coating adsorbed on the surface of rotary drum, Yibell Rotary Drum Vacuum Pre-coating Filter can discharge filter cakes automatically in coordination with scrapers. It can automatically carry out continuous operation under the condition of vacuum filtration. It can provide specially solid-liquid separation solution for soliquoid (slurry, sludge, etc) with such characteristics as fine-grained, colloid, block (blinding) etc, and reclaim clarified efflluent of high quality.