The invention discloses a method for recovering a coal pillar on a fully mechanized mining face. Spiral drilling machines are used for recovering main and auxiliary transport coal pillars, and coal pillar recovery is carried out during normal coal actual mining interval on the working face; and the spiral drilling machines are arranged on the head and tail of a conveyer of the fully mechanized mining face correspondingly, hydraulic pressure stations are respectively arranged on the hardened road surfaces on the two sides of the conveyer, the hydraulic pressure stations are connected with the spiral drilling machines nearby and provide power for the spiral drilling machines, in addition, an electronic control system is arranged to control start and stop of motors in the hydraulic pressure stations, and a coal sliding system connected with the conveyor is arranged below the spiral drilling machines. According to the method for recovering the coal pillar on the fully mechanized mining face, spiral drilling machine drilling and fully mechanized mining are combined to form a dual mining process, an existing production system is fully used to solve the safety problem of the rear top plate overhang of a lower end head frame of the working face, coal pillar resources originally planned to be discarded are further recovered, and the coal recovery rate is increased.