The invention relates to a high-efficient fine-milling machining method for a blade body molded surface of an aviation engine. The high-efficient fine-milling machining method for the blade body molded surface of the aviation engine is characterized by comprising the steps of drawing an equal-step rough milling cutter rail on a workblank molded surface three-dimensional model obtained through reconstruction, adopting a self-adaption variable feed processing method based on a constant cutting load for calculating a rough milling feed rate of a cutter at each cutter location point, and rough milling the blade body molded surface through a variable feed manner; and then drawing an equal-step fine-milling cutter rail on a rigid three-dimensional model, adopting a self-adaption variable feed method based on a molded surface normal-direction constant elastic deformation for calculating a fine-milling feed rate of the cutter at each cutter location point of the fine-milling cutter rail, and fine-milling the blade body molded surface through the variable feed manner. According to the high-efficient fine-milling machining method for the blade body molded surface of the aviation engine provided by the invention, the rough milling efficiency and the fine-milling machining efficiency of the blade body molded surface are remarkably improved, an effect improvement effect on machining products in batch is particularly remarkable, the cutter back-off for machining weak-rigidity blades is effectively avoided, and the machining surface quality is improved.