The invention discloses a waste liquor treatment process for a pig farm. The waste liquor treatment process is characterized in that a regulation tank, a heating tank, a CSTR (continuous stirred-tankreactor) anaerobic jar, an anaerobic film unit and an integrated efficient biological denitrification device are mainly involved. The waste liquor treatment process for the pig farm comprises the following steps: (1) collecting waste liquor of the pig farm, heating the waste liquor to be 30 DEG C or more and introducing the waste liquor into the CSTR anaerobic jar; (2) separating supernatant in step (1) through the anaerobic film unit, introducing obtained effluent into the integrated efficient biological denitrification device, and causing obtained concentrated water to return to the CSTR anaerobic jar; (3) causing sludge discharged by the integrated efficient biological denitrification device to flow back to a CSTR. The integrated efficient biological denitrification device is compact instructure, optimized in flow regime, high in denitrification efficiency, easy to control and low in energy consumption. According to the waste liquor treatment process for the pig farm, part of energy resources can be recycled, and the waste liquor treatment process has the advantages of high effluent quality, high denitrification efficiency, short process flow, convenience for system operation,low running cost, economy, high efficiency and the like.