Wind power gear box high speed shaft system

The utility model relates to a wind power gear box high speed shaft system which comprises a high speed shaft and a bearing in match with the high speed shaft. The wind power gear box high speed shaft system is characterized in that the low speed end of the high speed shaft adopts an NU type cylinder roller bearing. The high speed end of the high speed shaft adopts an N type cylinder roller bearing. The tail end of the high speed end of the high speed shaft adopts a four-point contact ball bearing. Due to the fact that the bearings are reasonably selected, the wind power gear box high speed shaft system has the advantages of enabling all the components arranged on the high speed shaft to be taken out with the high speed shaft during the process of dismantling of the high speed shaft system without using a tool to dismantle a back box body additionally, greatly improving efficiency during follow-up repair of a gear box, and lowering cost of the gear box.