Abstract: As one of the most important applications of terahertz waves, the terahertz imaging technology has a great application prospect in biomedical, security, non-destructive testing, quality monitoring and so on. Constrained by the diffraction limit, the resolution of conventional terahertz imaging technologies can only reach the wavelength level, which cannot meet the demands of many applications. The present paper systematically introduces serval non-real-time imaging methods that can beat the diffraction limit at terahertz wavelengths, including the near-field scanning optical imaging, the single-pixel imaging based on spatial modulators, the time reversal imaging and the imaging based on spatial spectrum sampling. The principle, development process, merits and limitations of each imaging method are reviewed and discussed in detail, and the future development of terahertz super-resolution imaging is prospected.