With the increase of the thickness of the main beam of the wind turbine blade, the lack of glue between the thickest area of the main beam and the web after the blade is clamped has become an important issue that affects the quality of the blade, product production cycle, and repair cost. The traditional glue deficiency repair method has high technical requirements, and the quality after repair cannot meet the design requirements, so this study designed a new glue deficiency repair method. According to the requirements of the wind turbine blade web bonding process, through defect analysis, simulation calculation and test, etc., this paper analyzes the repair method of punching holes in the main beam when the web is glued and lacking, which affects the strength of the wind turbine blade main beam and the bonding performance of the web.