The invention discloses a biological treatment device and process for high ammonia-nitrogen pig-raising biogas slurry. A body of the biological treatment device is a runway type photo-bioreactor, an efficient and low-consumption standard treatment process for the high ammonia-nitrogen pig-raising biogas slurry is constructed based on a microalgae, photosynthetic bacteria and plant compound ecological system, and meanwhile, algae bacteria biomasses and plants are harvested. The process comprises the following specific steps: pig-raising wastewater is subjected to solid-liquid separation and is introduced into an anaerobic fermentation tank, produced high ammonia-nitrogen biogas slurry is subjected to pH value regulation and nutritive salt regulation and is introduced into the photo-bioreactor to be treated, biochemical effluent is treated by virtue of a flocculation settling tank and a disinfecting tank, and clean water reaches the standard and is discharged. The biological treatment device and the biological treatment process have the advantages that the operation is simple, the removal efficiencies of nitrogen and phosphorus are high, the operation cost is low, the separated algae bacteria biomasses can be taken as the raw materials for feeds, biological hydrogen production or biodiesel, and the secondary pollution is avoided.