The utility model relates to a planetary gear gearbox which belongs to the technical field of planetary gear gearboxes for hydraulic transmission bulldozers. The utility model comprises components of a first group of planetary gear mechanism and a second group of planetary gear mechanism, such as clutches, clutch gear rings, planet carrier gears with planet carriers, planetary gears and central gears, wherein the first central gear and the second central gear are coaxial and are all power input gears.
The first planet carrier gear which is provided with the first planet carrier is engaged with the first clutch gear ring; the planet carrier of the first planet carrier gear is provided with the first planetary gear which is respectively engaged with the first central gear and a common gear ring; the second planet carrier gear which is provided with the second planet carrier is engaged with the common gear ring; the planet carrier of the second planet carrier gear is provided with the second planetary gear which is respectively engaged with the second central gear and the second clutch gear ring; the second planet carrier gear which is provided with the second planet carrier is a power output gear.
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