The invention discloses an extraction method for unloading gas in a goaf bed separation zone of an ultra-long working face and treating top corner and goaf gas. The method comprises the following steps that an upper gate backstopping tunnel, a middle gate backstopping tunnel and a lower gate backstopping tunnel are arranged for the ultra-long working face to form a 'W'-shaped ventilation system ofupper gate air inlet, lower gate air inlet and middle gate air return; after a high-level extraction drill and a high-level drainage tunnel are arranged at the middle-upper portion in an 'O'-shaped circle of the upper portion of middle gate goaf zone cover rock, backstopping is carried out; the high-level extraction drill and the high-level drainage tunnel are connected to an extraction branch pipe, and the extraction branch pipe is merged into a mine gas extraction utilization system for extraction control. The extraction method can efficiently extract and utilize high-concentration gas in an unloading fissure zone of the goaf bed separation zone, reduce the gas emission amount in the goaf zone of the working face, eradicate working face air return, top corner gas exceeding and goaf zonegas explosion accidents, improve the working face production efficiency and safety and ensure mine safe backstopping.