The invention discloses a maintenance-free type multifunctional longitudinal axial flow threshing and separation roller, comprising a winding-proof grass coil, a spiral feeding plate, a tapered barrel, amplitude discs, a roller shaft, bolts, nuts, spring washers, threshing tooth rod assembling strips, grass discharging plates, a round barrel, an elastic shaft coupler and a spline wheel disc, wherein the tapered roller is welded at the front part of the roller shaft; the plurality of amplitude discs are arranged and are uniformly welded in the middle of the roller shaft; fixed holes are uniformly formed in the amplitude discs; the round barrel is welded at the rear part of the roller shaft; the winding-proof grass coil is mounted on the tapered barrel; the spiral feeding plate is welded on the surface of the tapered barrel; the threshing tooth rod assembling strips are fixed on the fixed holes of the amplitude discs through fastening bolts, the nuts and the spring washers; a plurality of threshing tooth rod assembling strips are arranged, and a plurality of grass discharging plates are arranged; and the grass discharging plates are uniformly welded on the surface of the round barrel, the elastic shaft coupler is fixed at the rear end of the roller shaft, and the spline wheel disc is connected with the elastic shaft coupler through a fastening part. The maintenance-free type multifunctional longitudinal axial flow threshing and separation roller has the advantages of simple structure, good utilization effect, wide market prospect and the like.