In hydraulic system，in order to realize the non electric signal delay control of the hydraulic valve and improve the explosion proof ability and reliability of the time delay device in coal mine operation,a kind of pure hydraulic retarder was put forward.It was combined with the hydraulic valve to realize the purpose of time delay control.The composition,working principle and time delay realization method of the hydraulic time delay device were explained in detail.In addition,AMESim simulation software was used to model and simulate,and by varying the diameter of the damping hole,several sets of delay data were obtained.The simulation results show that the hydraulic delay valve can realize the time delay control of the hydraulic directional control valve.It provides a theoretical basis for further production and application of time delay device.