The invention provides an assembly device of planetary gear and an assembly method thereof, which can restrains the damage of addendum and mesh the first small gear and the second small gear with high precision to assembling a planet carrier. The small gear assembly system (40) of planetary gear assembly device (1) is formed by such steps: making a first small gear (41) and a second small gear (42) approaching one another towards the direction of orthorhombic with axes, making the first small gear (110) mesh the second small gear (120) in the vertical direction of the inclined state.
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