With the development of THz technology,a lot of suggestions and concepts have been proposed to improve the imaging quality or extend the imaging dimensions in the field of THz imaging. Most of them are borrowed from the fully developed techniques in other wavelength ranges. The combination of these techniques and THz imaging has become a current research focus,and confocal THz scanning microscope is such a technique among them. Based on an introduction to the principle of confocal scanning microscope,a comprehensive description of the advances in the domestic and international research of confocal THz scanning microscope is provided,which illustrate the exciting potential uses for this emerging technique.