Multifunctional grain combine harvester

The utility model relates to the technical field of combine machinery and in particular relates to a multifunctional grain combine harvester. The multifunctional grain combine harvester comprises a frame, wherein a cutting table is arranged at a position, which is positioned at the end of a front driving wheel, on the frame; an inclined conveyor and a single longitudinal axial flow roller are sequentially arranged downstream of the cutting table; a roller cover is fixedly arranged above the single longitudinal axial flow roller; a gridding concave plate is arranged below the single longitudinal axial flow roller; a grain cleaning device is mountedon the frame below the gridding concave plate; a grass discharging wheel is arranged at the tail end of the single longitudinal axial flow roller; a grain collection bottom shell is arranged below the grain cleaning device; a residue collection bottom shell is arranged at the tail end of the grain cleaning device; the grain collection bottom shell is connected with a grain lifter; a grain outlet of the grain lifter corresponds to a grain elevator; the residue collection bottom shell is connected with a residue lifter; an impurity discharging port of the residue lifter corresponds to a residue inlet at the front end of the single longitudinal axial flow roller. The multifunctional grain combine harvester has the benefits that the whole grain combine harvester is diversified in service functions, low in damage rate and high in utilization rate.