The invention relates to a planet wheel retarding stage in a wind driven generator gearbox. The planet wheel retarding stage comprises a planet carrier wheel system, wherein planet wheel pin rolls are hollow shafts; the two ends of each planet wheel pin roll are sealed by plug nuts to form an oil storage cavity; an oil duct communicated with the oil storage cavities is formed in a planet carrier side plate; the oil duct in the planet carrier side plate is communicated with a forced oil supply oil duct in a box through an oil duct in a slide ring and an oil ring; a lubricating oil hole is formed in the middle fracture surface of each planet wheel pin roll; symmetrical compensatory lubricating oil holes are further formed in the two sides of each lubricating oil hole, equal-length straight tubes which are inserted into the corresponding oil storage cavity are arranged in the two compensatory lubricating oil holes respectively, and oil inlets are positioned on end parts of the straight tubes; a planet wheel is supported on the planet wheel pin rolls through slide bearings; oil supply ring slots which correspond to the lubricating oil holes in the planet wheel pin rolls are further formed in the slide surfaces of the slide bearings; and the sections, corresponding to the compensatory lubricating oil holes, of the slide surfaces at the two sides of the oil supply ring slots are provided with axial oil storage grooves, so that lubricating oil which reaches each slide bearing forms a layer of oil film on the slide surface.