The utility model relates to a vehicle transmission field discloses a connecting device of gearbox and bell housing and have device's power take -off, connecting device included the cab apron, crossed cab apron central point and put and be provided with the shaft hole that holds one gearbox, and the shaft hole outside is provided with through -hole I, and through -hole I is used for connecting the gearbox, and connecting hole one -to -one on the position of through -hole I and the gearbox is crossed and still is provided with through -hole II on the cab apron, and through -hole II is used for connecting the bell housing, connecting hole one -to -one on the position of through -hole II and the bell housing. The utility model discloses a position and the specification size of adjusting hole on the cab apron can realize supporting connection the between bell housing and the multiple gearbox, have reduced the cost of the bell housing of the multiple specification of factory production and the edition of books body die sinking simple manufacture that passes through, and with low costs, the installation is simple reliable.