The safety valve is a key component of hydraulic support hydraulic pressurization in coal mines,but the high vaporization pressure of the aqueous medium causes the hydraulic components to be prone to cavitation at the throttle port.In order to study in depth the transient cavitation flow field distribution in the shaped cavity of the coal mine hydraulic safety valve,the simplified shaped cavity flow field of the safety valve was verified separately by Fluent software for grid and time step independence,after determining the number of grids and time steps,transient analysis of the shaped cavity flow field was carried out.The results of the transient simulation show that there is a certain periodic cavitation flow inside the flow field,the front and rear ends of the turbulent kinetic energy band promote the generation,development,and collapse of cavitation clouds,and the variation trend of cavitation period is opposite to that of turbulent kinetic energy value.The velocity vortex and the turbulent kinetic energy strips generated by the high-speed jet area are important factors affecting the periodic variation.