The utility model discloses a tractor modularization system of arranging, the driver's cabin at the back through the sectional shelf-unit with the fuel tank, vertical silencer, the battery box, gas receiver and empty filter equipment are an integrated module, install on whole car frame through the connecting plate, said fuel tank is the big oil tank of 400L, reserves the bellytank space on the upper portion of fuel tank, sectional shelf-unit left side lower part is equipped with the staircase of getting on the bus. The utility model discloses with oil tank, battery box, gas receiver, silencer are arranged on the sectional shelf-unit of driver's cabin rear portion, form unique modularized design, can effectively shorten whole axletree distance, rational distribution load also be convenient for simultaneously installation and dismantling can whole dismouting during the maintenance, convenient and fast, and improvement labor efficiency that can be great, the leading distance of adjustable saddle can conveniently be mated the trailer of different front overhang and made the burden distribution of tractor each shaft more equitable