Efficient numerical-control machining method for large flexible blade

The invention discloses an efficient numerical-control machining method for a large flexible blade and relates to the efficient numerical-control machining method for the large flexible blade. The method aims at solving the problems that in an existing method, machining time is long, production cost is high, and the surface of the blade is not even due to cutter vibrating during blade machining. The method includes the processes that firstly, a blade boss is machined, the blade boss is located in the middle of the blade, a climbing outline milling manner is used for milling machining for removing the margin, after the margin is removed through climbing outline milling, and a face milling cutter is used for machining a steam lane fillet between the blade boss and a steam lane to the size required by a product with the inclination angle ranging from 30 degrees to 45 degrees; secondly, the steam lane is machined, an equal-step-distance manner is used for machining, a straight-rod four-axis linkage machining mann