The invention discloses a micro planetary reducer used on a dial linking machine. The micro planetary reducer used on the dial linking machine comprises a shell. Through holes are formed in the two end faces of the shell respectively. An input shaft and an output shaft penetrate through the through holes in the two ends respectively and are separated from the shell through bearings. An inner ring gear is fixed to the inner side of the shell. At least one transmission gear set is arranged between the input shaft and the output shaft. Each transmission gear set comprises a sun gear, a plurality of planetary gears and a planetary carrier, wherein the sun gear is surrounded by the planetary gears; one side of each planetary gear is engaged with the sun gear, and the other side of each planetary gear is engaged with the inner ring gear of the shell; a plurality of planetary rotary shafts are arranged on the end face of one side of a planetary carrier body; the planetary gears are rotatably installed on the planetary rotary shafts. The sun gear in the transmission gear set on the side close to the input shaft is installed on the input shaft, and a main rotary shaft of the planetary carrier in the transmission gear set on the side close to the output shaft is fixedly connected with the output shaft. According to the micro planetary reducer used on the dial linking machine, the transmission gear sets are compact in structure; compared with an existing reducer with the same transmission ratio, the size is greatly reduced, and the micro planetary reducer is more suitable for being applied to various kinds of equipment.