The invention relates to a high-voltage motor stator coil corona-preventing structure optimizing method based on electric field analysis. The high-voltage motor stator coil corona-preventing structure optimizing method includes the following steps: determining the stator coil corona-preventing structure analysis modeling portion; obtaining modeling parameters according to the structure and the size of the modeling portion determined in the step (1); building a three-dimensional finite element model of the coil corona-preventing portion according to the modeling parameters obtained in the step (2); defining the characteristics of various materials of a coil and the insulation corona-preventing portion in the calculating model; determining the type of stimulation exerted on the stator coil calculating model and boundary conditions; carrying out finite element calculation and the electric field analysis on the coil calculating model, and judging the problems of the corona-preventing structural design. According to the high-voltage motor stator coil corona-preventing structure optimizing method based on the electric field analysis, the three-dimensional finite element analysis model is built by reasonably simplifying and assuming a practical model, and the visible and accurate corona-preventing layer electric field distribution result is accordingly obtained; in addition, the simulation calculated amount can be effectively reduced, and the simulation efficiency can be improved.