The invention provides a planetary gear train bearing lubricating structure. A planetary gear train comprises a planet carrier, a plurality of planetary gears installed on the planet carrier through planetary gear shafts, and a bearing arranged between the planetary gears and the planetary gear shafts. The planetary gear train bearing lubricating structure comprises axial holes, at least one through hole, oil collecting plates and an oil pool, wherein the axial holes are distributed in the axial direction of the planetary gear shafts; the through holes extend from the axial holes to the diametric planes of the planetary gear shafts; at least one ends of the planetary gear shafts are provided with the oil collecting plates, the oil collecting plates are installed on the planet carrier, thepositions, opposite to the axial holes of the ends of the planetary gear shafts, of the oil collecting plates are provided with oil collecting grooves correspondingly, the opening direction of the oilcollecting tanks is consistent with the rotating direction of the planet carrier, and the oil collecting tank, the axial holes and the through holes form oil way channels for allowing lubricating oilto circulate; and the oil pool is located in a shell of the planetary gear train. The oil collecting plates rotate, when the oil collecting grooves rotate and pass through the oil pool, the lubricating oil is collected and conveyed to the outside of the planetary gear shafts through the oil way channels.