The invention relates to a tail of a scraper conveyor at the rear part of a working face, and particularly relates to a tail drive transmission device for rear scraper conveyors. The tail drive transmission device comprises a motor (1), a speed reducer (2) and a tail sprocket shaft set (4) which are sequentially rotatablely connected, wherein the tail sprocket shaft set (4) is arranged on a tail (5); and the tail drive transmission device is characterized in that the motor (1), the speed reducer (2) and the tail (5) are basically arranged in a same straight line. After the tail drive transmission device is used, the problem that parallelly-arranged power parts of the tail of a rear scraper conveyor occupy a shoring space at the rear part of a transition support is solved, so that the transition support and a middle support can be designed to supports in a unified model, thereby simplifying the technological procedures of support increasing and decreasing implemented due to the length change of a working face; meanwhile, the end coal-placing effect is improved, the coal-placing capacity is improved, and the recovery rate of coal resources is further improved; and the distance between the centers of tails of front and rear scraper conveyors is consistent with the distance between the centers of the middle sections of the front and rear scraper conveyors, thereby reducing the hysteresis phenomenon of the tail of the rear scraper conveyor, and improving operating situation of the tail of the rear scraper conveyor.