The invention discloses a middle roadway pre-excavated over-400m ultra-long working face arrangement method. Three roadways are excavated in a coal seam and include a track roadway, a transport roadway and the middle roadway, the track roadway and the transport roadway are positioned on two sides of a working face, vertical distances of the track roadway and the transport roadway are not smaller than 400m, and the middle roadway is positioned in the middle of the working face. The track roadway and the transport roadway are air inlet roadways while the middle roadway is an air return roadway,so that a 'W'-shaped ventilation mode with two air inlet roadways and one air return roadways is formed, ventilation quantity is increased, and working face methane ventilation distance is reduced. The middle roadway is used for pedestrians and material transporting, traveling distance in the working face can be reduced, and labor intensity is relieved.