The utility model discloses a clamping device for machining an intermediate ring of a synchronizer. Mounting base plate, a machining table is mounted in the middle of the upper surface of the mountingbottom plate through welding. Threaded plates are installed in the middles of the edges of the upper surface of the machining table in a welded mode. A pushing clamping assembly is inserted into themiddle of the threaded plate in a penetrating mode. The utility model is scientific and reasonable, safe and convenient use, rotary bearing, the limiting insertion rod is taken down; 180-degree rotation of the clamping plate can be realized; further, the rotation of the synchronizer intermediate ring to be processed can be realized; the other side of the synchronizer intermediate ring can be machined; the synchronizer intermediate ring is prevented from being disassembled and clamped again, on one hand, the machining time of the synchronizer intermediate ring is saved, the machining efficiencyof the synchronizer intermediate ring is improved, on the other hand, frequent rotation between the threaded rod and the threaded plate is reduced, abrasion to the threaded rod and the threaded plateis reduced, and the service life of the device is prolonged.