It is difficult for the terahertz radiation to interact electromagnetically with most materials in nature due to its spectral specificity, which results in the terrible scarcity of terahertz functional devices. The terahertz metamaterial which is periodic arrangement of artificially designed units with subwavelength, can regulate the electromagnetic response of the terahertz band and become the research hotspot. In this paper, a kind of terahertz band-stop metamaterial with a single-layer metal square resonant ring on silicon dioxide substrate is designed, which has a narrow width and deep band-stop characteristics, and is insensitive to polarization. The band-stop resonance is attributed to the electric dipole resonance in the metal square resonant ring. Moreover, the proposed structure is easy for fabrication, and will be applied in the fields of terahertz modulation devices, THz communication and photoelectric detection.