The invention provides a method for preventing an antenna from deforming in the stamping process. Air holes are formed in an ejector retainer plate of a stamping die, air is injected into the air holes while the stamping process is completed, and airflow is used for easily blowing out bent parts of products. The method is simple and practical, the airflow is used for easily blowing out the bent parts of the products after stamping through the die, deformation caused by external force dragging is avoided, production quality is improved, and the products have high market competitiveness.