The invention discloses an antenna fixing device which comprises a support plate and an antenna bracket, wherein the support plate is in a preset plate shape, the ends of the support plate are fixed to an attachment body, one end of the antenna bracket is fixed with an antenna, and the other end of the antenna bracket is fixed above the support plate through a preset way. In the antenna fixing device, the antenna is fixed with the fixing of the support plate to the attachment body; because the attachment body can be various fixed structures of wall surfaces, the bottoms of outdoor elevated platforms, telegraph poles, side surfaces of pedestrian corridors and the like, a fixing mode of the antenna is more simple and flexible; in addition, the height of the antenna can be freely selected in the fixing process of the antenna without the arrangement of a very long hanging reinforcement; in addition, because the antenna can be hidden by making use of the support plate when being fixed, and the shape and the color of the support plate can be flexibly designed, the purposes that the antenna fixing device is adapted to the surrounding environment and has beautiful apperance are reached; and in addition, compared with the expensive integrated hidden antenna, the antenna fixing device is lower in cost.