Abstract: As an active microwave imaging technology, inverse synthetic aperture radar (ISAR) has the ability to perform high-resolution imaging of non-cooperative targets all day and all weather, and has been widely used in both civil and military fields. Compared with the traditional two-dimensional imaging, three-dimensional ISAR imaging can effectively overcome the challenges such as missing height-direction information and geometric deformation, which is beneficial to the detection and recognition of targets. Therefore, three-dimensional ISAR imaging technology plays an important role in fields such as target recognition and space asset maintenance, and it has gradually become a research hotspot in the field of ISAR imaging. The basic principles, advantages and limitations of different three-dimensional ISAR imaging methods are systematically reviewed in this paper. Firstly, the principles of different three-dimensional imaging methods are introduced. Then, on this basis, the research status of various three-dimensional ISAR imaging methods is summarized, and the characteristics and existing problems of various methods are analyzed. Finally, combined with the current research status and technical development trend, the prospects for directions of three-dimensional ISAR imaging development are discussed from aspects such as imaging algorithms, post-imaging processing, and data fusion.