Abstract: Producing biological gas using livestock manure anaerobic fermentation has become an important way for large scale farms to solve environmental problems and obtain biological energy.Rational utilization of biogas slurry produced by anaerobic fermentation is one of the difficult problems in the face of biogas engineering.Starting from the implementation of reduction，resource to use biogas slurry and residue separation，a combined solid-liquid separation device suitable for biogas slurry and residue separation was designed.It provides reference for treatment of biogas slurry using engineering method.