Planetary transmission

The utility model discloses a planetary transmission. The planetary transmission comprises a shaft a (1) and a gear lever (3) and further comprises clamps (2), a sun gear (4), a planetary gear set (5) and a hub (14), wherein the clamps (2), the sun gear (4), the planetary gear set (5) and the hub (14) are sequentially installed in a sleeved mode from inside to outside. The sun gear is sleeved between the adjacent clamps (2) on the shaft a. A planetary gear carrier (9) is sleeved with a planetary gear shaft (10). The planetary gear shaft (10) is sleeved with a planetary gear I (6), a planetary gear II (7) and a planetary gear III (8). The hub (14) is provided with internal teeth, and the planetary gear I (6) is meshed with the internal teeth of the hub (14). The planetary gear II (7) and the planetary gear III (8) are meshed with the sun gear (4) respectively. The planetary transmission is simple and compact in structure and fast and simple in speed change, gaps between the components are small, and the number of gears of speed change which can be achieved by the planetary transmission is larger under the same shape, structure and space conditions.