The utility model relates to a still field machine is smashed to floating multilayer of broad width cutting straw belongs to agricultural machine technical field. This quick -witted final drive case is connected with front axle and backshaft drive respectively, the lower part that hangs the mechanism links firmly with left and right stationary side plate, and left and right stationary side plate is articulated with left and right floating side plate respectively, fixes back beam between the left and right floating side plate and supports the rear axle, front -axle beam and back beam are linkedfirmly by the left and right section of middle section and the both sides connecting plate through the adjoiner respectively and constitute, front axle and rear axle are linked firmly by the at leasttwo sections flange interfaces through the adjoiner respectively and constitute. So not only can borrow floating assisting to move the structure and conveniently pass through regulation and control hydraulic cylinder, the broad width operation needs are satisfied in the regulation of taking the circumstances into consideration to deep plough, are showing and are raising the efficiency to be convenient for make and the assembly, can also be by carrying out free dismouting and present tractor power to rotary blade, arbor and frame roof beam, the working breadth of the garrulous stalk of rational choice machines rotary tillage stops to draw the unmatched phenomenon of power and work tool.