NOVELTY - Coating machine comprises a support (1), an upper roller (2) rotatably mounted in the support and a driving motor. The outer wall of the upper roller is fixedly mounted with a track ring (3) and a ring gear (4). The ring gear is drivingly connected to a driving motor through a driven gear (5). The track ring is installed on a supporting roller in rotating manner. The upper section of the supporting roller is set with a U-shaped ring groove. The track ring is installed in the ring groove of the supporting roller. The inner cavity of the upper roller is set with a tapered structure at front end.    USE - The coating machine is useful for producing bio-fertilizer for rice weeding (claimed).    ADVANTAGE - The coating machine: has high production efficiency; and can complete granulation, screening, drying and other processes at one time.    DETAILED DESCRIPTION - Coating machine comprises a support (1), an upper roller (2) rotatably mounted in the support and a driving motor. The outer wall of the upper roller is fixedly mounted with a track ring (3) and a ring gear (4). The ring gear is drivingly connected to a driving motor through a driven gear (5). The track ring is installed on a supporting roller in rotating manner. The upper section of the supporting roller is set with a U-shaped ring groove. The track ring is installed in the ring groove of the supporting roller. The inner cavity of the upper roller is set with a tapered structure having small diameter at front end, and tapered structure having large diameter at back end. The back end of the upper roller is set with a transfer hopper. The upper end of the transferring hopper is set with a ventilating hole, the lower end is set with a discharging pipe, and the side wall is set with a butt joint roller. The lower part of the support is installed with a lower roller n rotating manner. The inner cavity of the lower roller is set with the tapered structure having large diameter at front end, and the tapered structure having small diameter at back end. The back end of the lower roller and the discharge pipe are connected. The inner wall of the upper roller is fixedly connected with a lining sleeve. The lining sleeve is made of flexible material. The upper roller is set with coaxial and cylindrical structure. The both ends of the lining sleeve are fixedly connected to the both ends of ring sealing of the upper roller through an annular seal. The outer wall of the lining sleeve is fixedly connected with axial extending and locating bar. The multiple pieces of the location bars are distributed surrounding the lining sleeve, and fixedly connected to the inner wall of the upper roller, tube wall of the lining sleeve, and the two adjacent locating bars are fixedly connected with a strip with heavy iron.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the coating machine for producing bio-fertilizer for rice weeding.    Support (1)    Upper roller (2)    Track ring (3)    Ring gear (4)    Driven gear (5)