The invention discloses a square-column-type embellished-antenna horizontal-plane azimuth-angle adjustable structure component. The component comprises a calibration mechanism formed by a support shaft, a bearing end cap, a bearing, a clamp spring, a bearing pedestal, an installing plate and the like, a transmission mechanism and a shell portion. Through the mechanisms, the component is adjustable and is convenient to use, and an adjustable scope covered by a radio wave signal of a square-column-type embellished antenna can be realized. The bearing pedestal and the installing plate are connected in a welding form. The bearing end cap and the installing plate are connected through a bolt mode so that a bearing component can be guaranteed to be fixed to the installing plate. Through the structure component, antenna horizontal azimuth angle can be accurately and conveniently adjusted so that an antenna radiation coverage effect is ideal.