The invention discloses an antenna fixing apparatus for strengthening a concentrator signal. The antenna fixing apparatus comprises a transverse plate and a vertical plate, wherein a first sliding groove is formed in the transverse plate; an adjusting base is arranged in the first sliding groove; a signal receiver is mounted on the side face of the adjusting base; the adjusting base comprises an outer cylinder and an inner cylinder; the inner cylinder is arranged in the outer cylinder in a sleeving manner; a first spring is mounted between the inner bottom of the outer cylinder and the bottom surface of the inner cylinder; a strip-shaped opening is formed in the side wall of the outer cylinder; elastic clamping sheets are mounted in the strip-shaped opening; the lower ends of the elastic clamping sheets are hinged with the side wall of the outer cylinder; the upper ends of the elastic clamping sheets can be folded to the outer cylinder, and a fixing block is mounted at the upper ends of the elastic clamping sheets; a second sliding groove is formed in the fixing block; a supporting transverse rod is arranged in the second sliding groove; one end of the supporting transverse rod is movably in contact with the second sliding groove; the other end of the supporting transverse rod is horizontally fixed to the inner cylinder; an arc-shaped groove is formed in the side wall of the first sliding groove along the direction of the first sliding groove; and due to the matching of the arc-shaped groove and the elastic clamping sheets, the adjusting base can be fixed. The antenna fixing apparatus is steady in structure; and the signal receiving and transmission accuracy of the antenna is improved by additionally providing the signal receiver and the adjusting base.