The invention discloses an oblique arc-shaped elevator cable guide tightening device, which is characterized by comprising a track guide rail, a pulley, a cable chute and a guiding wheel set, wherein, the cable chute is fixed on an elevator hoistway wall; the pulley is supported by the track guide rail and is guided by the track guide rail; the guiding wheel set is arranged on the pulley; a trailing cable one end of which is fixed on a car; after the trailing cable winds the guiding wheel set, and the other end of the trailing cable is fixed at the upper part of the hoistway; the part of the the trailing cable winding the the guiding wheel set falls into the cable chute all the time. The device of the invention can be used for various elevators the hoistways of which are provided with slope or slope and radian; as the trailing cable which moves up and down along the car is wound on three flexibly sliding guiding wheels, and is tightened by the pulley, and the guiding action of the track guide rain is acted on the pulley, so that the normal operation of the trailing cable in the oblique hoistway or in the oblique circular-arc hoistway is effectively ensured; and the trailing cable moves in the fixed cable chute to avoid the influence of the trailing cable on the other parts of the elevator hoistway.