The corresponding wavelength of Terahertz (THz) wave is 30–3000 μm [1]. Compared with infrared, THz wave has stronger penetration, and the photon energy level of THz wave is lower, which is harmless to the body [2–4]. In recent years, terahertz technology has shown great potential in the field of imaging and detection, which can provide high-resolution and high-contrast imaging results. However, conventional terahertz imaging is limited by the divergent propagation characteristics of high-order orbital angular momentum beams, resulting in the rapid increase of terahertz wave spots with the transmission distance, which limits the long-range detection application of terahertz imaging. In view of the above problems, this design proposes a vortex antenna based on artificial surface plasmon polaritons (SSPP). The antenna is composed of an annular SSPP transmission line composed of comb lines and a circular patch. When the circular patch is placed around the annular transmission line, the metal patch radiates by coupling its electromagnetic waves, which realizes the excitation of high-order vortex modes at different frequencies, so as to achieve multi-mode signal transmission and beam control requirements. The antenna has the characteristics of small profile and easy integration, which lays a foundation for the long-distance detection of terahertz beam.