The invention provides a switching device, and a contact assembly and a stationary contact thereof. The switching device comprises a shell in which the contact assembly is arranged, wherein the contact assembly comprises a movable contact and the stationary contact, the stationary contact comprises an outer-side support on which an external conductive portion contacted and conductively matched with the outer circumferential surface of the movable contact is arranged, the stationary contact also comprises an inner-side support on which an internal conductive portion contacted and conductively matched with the inner circumferential surface of the movable contact is arranged. The switching device has the advantages that the stationary contact also comprises the inner-side support on which the internal conductive portion contacted and conductively matched with the inner circumferential surface of the movable contact is arranged, the internal conductive portion and the external conductive portion work at the same time, so that the contact area between the stationary contact and the movable contact is increased, the contact resistance between the same is reduced, the conductive flow capacity is enhanced, and the heating phenomenon is effectively relieved, the switching device can be applied to large current occasions, and the service life of the switching device is prolonged.