The hydraulic pressure sensing technology based on photonic crystal fibers (PCFs) has important research significance and broad application prospects due to its advantages of high sensitivity, strong anti-interference ability, and adaptability to harsh environments, so it has received special attention from researchers in recent years. Based on the brief introduction of the basic principles of PCF hydraulic pressure sensing, several typical PCF hydraulic pressure sensing technologies, namely birefringent PCF hydraulic pressure sensing technology, PCF grating hydraulic pressure sensing technology, Fabry-Pérot cavity PCF hydraulic pressure sensing technology and dual-core PCF hydraulic pressure sensing technology, are mainly presented. The principles and technical schemes of these four PCF hydraulic pressure sensing technologies are introduced respectively, and their performances are analyzed, compared and summarized. Finally, the research status and future development trend of PCF hydraulic pressure sensing technology are briefly summarized.