Planetary reducer for roller

The utility model discloses a planetary reducer for a roller. Including a housing, a side surface fixing ring is fixedly mounted on the other side of the shell; cavities are formed in the side face fixing ring and the shell correspondingly, a spline sun wheel shaft is movably connected to the position, close to one end, in the shell through a bearing, the side face fixing ring is fixedly installedon one side of the shell, and a three-level planet carrier is movably connected to one side of the side face fixing ring through a bearing. The utility model discloses a planetary reducer for a roller. A second-stage sun gear, a third-stage sun gear, a first needle bearing, a first-stage planet gear, a first-stage planet pin, a first-stage planet carrier, a second-stage planet carrier, a second-stage planet gear, a second needle bearing, a second-stage planet pin, a third needle bearing, a third-stage planet gear, a third-stage planet pin and a third-stage planet carrier are arranged; the problems that a traditional