The high speed on-off valve, servo valve and other piezoelectric hydraulic valves with piezoelectric actuator as the core have the advantages of high frequency response, good inching performance, and compact structure and so on. They are one of the new valve control types, and have attracted the continuous attention of researchers at home and abroad. First of all, the classification and characteristics of piezoelectric actuators for valves are introduced. According to the working principle, they are divided intotwo categories of direct push and step-by-step, and four types. Secondly, the research progress of four typical types of piezoelectric valves, namely pilot type, direct drive type, nozzle flapper type and switch type, are summarized, and their representative structures and performance characteristics are analyzed. The results show that with the increasing demand for precision and intelligence of hydraulic valve in the future, the application prospect of piezoelectric hydraulic valve is broader. Therefore, in addition to the development of high-performance dielectric materials, some key piezoelectric driving and control technologies such as micro displacement amplification and hysteresis compensation control are still worth exploring deeply.