Terahertz (THz) technology, as a very important interdisciplinary field, has brought profound impacts to fields such as environmental detection, biomedicine, and space communication. However, due to the impact of THz waveguide transmission performance, the comprehensive development of THz technology is still limited. Photonic Crystal Fiber (PCF), as a new type of THz waveguide, has infinite single mode characteristics, flexible and adjustable dispersion, controllable nonlinearity, high birefringence, and other characteristics, greatly promoting the development of THz technology. This article first summarizes the development history, light guiding mechanism, and optical characteristics of Solid Core PCF and Hollow Core PCF based on the structural characteristics of PCF; Secondly, the problems and corresponding solutions of PCF used for THz waveguides were summarized; Then, the application of PCF in THz time-domain spectroscopy, THz transmission and communication, and THz fiber coupled sensing was emphasized; Finally, a summary and outlook were made on the application of PCF in THz technology.