Multi-function hydraulic component detecting bench is used for detection work of the components, which were replaced because of failure in plate production line of iron and steel enterprise. The structure of multi-function hydraulic component detecting bench and basic principle of hydraulic system were introduced. A hydraulic system was designed by analyzing its performance demands, and the component selection was done. The designed multi-function hydraulic component detecting bench has the advantages of reliable scheme and performance, wide range of application, computer aided testing, high measurement accuracy and easy to use. It can provide reliable basis for maintenance and assessment of hydraulic components.