The utility model discloses a multifactor accelerated aging test device for a composite pole. The multifactor accelerated aging test device comprises an aging test room, wherein water nozzles and acid-alkali-salt sprayers are arranged on the top surface of the aging test room respectively; ozone generators, ultraviolet lamps, high-low temperature and humidity devices and a tensile machine are arranged on the side walls of the aging test room respectively; a traction rod is connected to an action end of the tensile machine, a dynamometer is arranged on the traction rod; and weights, conducting wires, longitudinal strain gratings, circumferential strain gratings and a signal detection processor electrically connected with the dynamometer, the longitudinal strain gratings and circumferential strain gratings are arranged in the aging test room in positions corresponding to the position where a to-be-detected composite pole is arranged. Through mutual matching of the water nozzles, the acid-alkali-salt sprayers, the ozone generators, the ultraviolet lamps, the high-low temperature and humidity devices, the tensile machine, the weights and the conducting wires, various natural environments are simulated comprehensively, so that the performance of the composite pole can be tested more comprehensively and accurately, and the multifactor accelerated aging test device is suitable for tower test.