Chassis transmission system for installing operation device between front axle and rear axle

The utility model relates to a chassis transmission system for installing an operation device between a front axle and a rear axle. Comprising a power system, the power system transmits power to a gearbox I, one path of the gearbox I transmits the power to a front axle to drive front wheels, the other path of the gearbox I transmits the power to a gearbox II through a transmission shaft set, and the gearbox II transmits the power to a rear axle to drive rear wheels. Based on main transmission parts and a frame of an original commercial vehicle, through reasonable matching, large operation space and installation space of a middle working device of the snow sweeper are achieved, and four-wheel drive of the vehicle is achieved. The front gearbox and the rear gearbox are adopted, the input shaft and the output shaft of the gearbox have a certain drop distance, the installation direction can be changed according to needs, the space for installing an operation device in the middle of the vehicle chassis and the ope