Metalens, a two-dimensional metasurface structure, has attracted widespread attention in the last decade. Compared with conventional optical lenses, metalenses are featured with ultra-thinness and ultra-lightness, as well as multifunctional design and modulation capabilities. Thus, they play an indispensable role in promoting the development of optical systems to miniaturization. In microscopic imaging technology, metalenses provide a multidimensional perspective, which demonstrates their great potential in innovation. In this paper, the recent progress of superlensing in microimaging technology is comprehensively reviewed. First, the wavefront modulation principle of metalens is elaborately explained and the design method of metalens is summarized. Second, the main fabrication techniques of metalens are introduced. Finally, the applications and research progress of metalens in microscopic imaging technologies are insightfully reviewed, such as light-sheet fluorescence microscopy, two-photon fluorescence microscopy, and endoscopy.