The invention provides a switching device to realize stepless adjustment of the length of a drive shaft between an operating mechanism and the switching device body. The switching device is composed of a switching device body and an operating mechanism. The switching device body includes a body input shaft. The operating mechanism includes a mechanism output shaft that can make straight reciprocating motion along the axial direction; a mechanism joint part is arranged at one end of the mechanism output shaft; a body joint part is arranged at one end, facing the mechanism output shaft, of the body input shaft; the two joint parts that are fixed relatively in an axial direction and rotate relatively along the peripheral direction are assembled together; and at least one of the two joint parts is installed at the corresponding shaft spirally and adjustably along the straight movement direction of the mechanism output shaft. According to the invention, the joint parts can rotate at any angle without affecting assembling of the two joint parts; the stepless adjustment is realized; and the assembling angles and assembling directions of the two joint parts do not need to be considered.