In order to carry out the aging state detection research of rubber O-ring sealing structure,a typical experimental device of rubber O-ring sealing structure based on engineering practice was designed,and the application of the experimental device combined with an example was explained.This experimental device not only can conveniently carry out the motivate experiment under freedom condition and constrained condition,but also can achieve the difference of compression amount of rubber Oring and shape and size of bush groove conveniently.It is convenient to replace bush groove and rubber O-ring,and thus the different structural aging states can be simulated by changing the rubber O-ring with different aging degrees.This experimental device facilitates the arrangement of sensors,can simulate different media pressure by air pressurization,and can keep the axial position of the bushing stable without affecting its rotation relative to the cylinder assembly.This paper provides experimental basis for the aging state detection research of rubber O-ring sealing structure.