Middle-arranged multifunctional automotive speed changer

The utility model provides a middle-arranged multifunctional automotive speed changer which comprises a box body. A gear input shaft is arranged on the box body, the input end transfers power to the input shaft through an input connecting disc, the input shaft penetrates through the box body to reach the inside and is matched with the box body through a deep groove ball bearing and an oil seal, the gear input shaft and an output shaft are arranged coaxially, a gear hub and a gear sleeve are arranged on the output shaft, the gear sleeve is driven to move through a shifting fork, two sides of the gear sleeve can be meshed with a gear of the gear input shaft and a driven gear a on the output shaft respectively, the driven gear a is arranged on the output shaft in an empty sleeving mode, and the other end of the output shaft penetrates through the box body to extend to the outside and is connected with other parts through an output connecting disc.