Abstract: By analyzing the action principle of the hydraulic disc spring operating mechanism the auxiliary switch, an integrated auxiliary switch switching device was designed, which integrates the different stroke correspond auxiliary switch switching angles requirements of the mechanism into a set of auxiliary switch switching devices, greatly improving the universality and adaptability of the auxiliary switch switching control device and the mechanism, And also the dimension chain analysis and calculation were conducted on the different position angles range of the auxiliary switch switching device. The connection position of the auxiliary contact was set at the buffer end of the mechanism, effectively reducing the occurrence of contact bounce and interruption, greatly improving the accuracy and reliability and stability of the auxiliary contact movement.