Numerical control machining method for blade with non-through back wing angle

The invention discloses a numerical control machining method for a blade with a non-through back wing angle, relates to a blade numerical control machining technology, and aims to solve the problems of poor machining precision and consistency of a back wing angle of a blade. The method comprises the following steps of performing solid mannerling on the to-be-machined blade by means of UG software, and establishing a blade solid mannerl; performing offset surface operation on a back radial surface of the established blade solid mannerl to obtain a first offset solid mannerl of the blade; performing offset surface operation on a steam inlet and outlet side and a blade root conical surface of the first offset solid mannerl of the blade to obtain a second offset solid mannerl of the blade; and processing the second offset solid mannerl of the blade through a regional milling driving method, so as to generate an automatic machining program, and loading the automatic machining program generated in the fourth step t