The present invention discloses a precise calculation method for a winding stator mode of an AC motor. Targeted as the case where winding stators of middle and small AC motors have multiple types of materials and are complex in structure and the like, the present invention provides a method for accurately calculating a winding stator mode by combining actual stator mode parameter testing and finite element emulation calculation and considering influences of an equivalent insulation layer of a stator iron-core lamination structure, and quality and stiffness of an in-slot winding and an end winding on a mode. The method solves the difficulty in accurately calculating and analyzing an actual model mode in the case that a winding stator has multiple types of materials and is complex in structure.