The invention relates to a compound planetary gearbox of a wind driven generator. The compound planetary gearbox is characterized by comprising a spindle system, an outer planetary system, an outer gear ring, an inner gear ring, an inner planetary system and an output shaft system, wherein the spindle system comprises a main driving shaft, a spindle support and a gear ring matched turntable; the left end of the main driving shaft is connected with an impeller and the right end is fixedly connected with the gear ring matched turntable; the spindle support is installed on the part, close to the gear ring matched turntable, of the main driving shaft in a sleeving manner; a plurality of gear teeth are arranged on the outer side of the gear ring matched turntable; gear teeth are arranged on the outer surface of the outer gear ring; the inner gear ring is inlaid inside the outer gear ring; gear teeth are arranged inside the inner gear ring; the gear teeth on the inner gear ring are matched with the gear teeth on the outer side of the gear ring matched turntable; the outer planetary system comprises an outer planetary fixed plate, an outer planetary carrier and coaxial double-gear planetary gears; the outer side of the outer planetary fixed plate is fixedly connected with a shell of the gearbox; the inner side of the outer planetary fixed plate penetrates through the spindle support.