Gear shifting mechanism, transmission and vehicle

The invention discloses a gear shifting mechanism, a transmission and a vehicle to solve the problems that the total size of the transmission is not easy to compress and the space utilization rate is low due to the fact that the number of shifting fork shafts of an existing gear shifting mechanism is large. The reverse gear shifting fork assembly specifically comprises a first shifting fork shaft, a second shifting fork shaft, a first shifting fork block, a second shifting fork block, a reverse gear shifting fork block and a reverse gear guide block. The first shifting fork shaft and the second shifting fork shaft are arranged in parallel; the first shifting fork block is fixedly installed on the first shifting fork shaft, the reverse gear guide block and the reverse gear shifting fork block are fixedly installed on the second shifting fork shaft, and the second shifting fork block is arranged on the second shifting fork shaft in a sliding and sleeving mode. A first protruding block is arranged on the first s