Optical imaging technology has greatly expanded the limits of human vision and improved people's ability to observe and understand the real world. The more optical information of the object we can acquire, the more understanding we will get. Digital holography is an imaging technique that allows the three-dimensional information of a sample to be encoded and recorded in the form of a two-dimensional hologram. By obtaining the interference pattern generated by the superposition of the object light wave carrying object information and the reference light wave, multiple reconstruction modalities such as image recovery, phase imaging and optical sectioning can be realized in a digital way. Optical scanning holography (OSH) is a unique digital holography technique that uses active two-dimensional (2D) scanning to image a three-dimensional (3D) object and then uses a single-pixel detector to capture the complete wavefront information of the 3D object. By using optical heterodyne detection to demodulate the signal, a complex hologram is recovered. This review discusses and overviews the recent progress in the OSH technique, including three types of advancements. The first one focuses on the advancements in the performance of optical system, such as spatial resolution improvement and scanning-time reduction, using specially designed hardware and algorithm based on the characteristics of a two-pupil imaging system. The second type of advancement relates to reconstruction modalities, such as sectioning and 3D imaging, where reconstruction of high-quality image is achieved by improving and optimizing the holographic reconstruction algorithms based on the principle of computational imaging. The third one is the development of various research topics related to the OSH technique. This paper also discusses potential and presents some topics for future investigations.