The invention discloses an extra-long working surface fully mechanized coal mining process, which belongs to the technical field of coal mining. Due to the adoption of the process, a fully mechanized mining working surface can be 1,500-3,000 meters in length. The process comprises the following steps of: arranging a hydraulic bracket 13 in an open-off cut, arranging scraper conveyors 14 below front and back top beams of the bracket 13, making a drum coal cutting machine 12 ride on a coal blocking side rack of the front scraper conveyor 14 on the working surface, driving the drum coal cutting machine 12 to walk on a front slipping rack under the action of electric traction through walking teeth, cutting the coal wall of the fully mechanized mining surface by using the drum coal cutting machine 12, making cut coal wall coal briquettes fall into the front scraper conveyor 14, and transporting out of the working surface; and injecting a liquid into top coal on the working surface through the hydraulic bracket 13, supporting a top beam, applying pressure to a top plate, crushing top coal, lowering a back beam of the bracket 13, making crushed top coal fall into a back scraper conveyor 14 from a coal feeding port behind the bracket 13, transporting coal to a reversed loader through a back scraping plate 14, and transporting coal out of the working surface through the reversed loader, the crusher and a belt conveyor.