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As a positioning reference part for wing assembly, how to effectively reduce the deformation of wing parts and improve the machining accuracy is an important task. A control method for the flatness warping deformation of wing beam parts during processing is proposed. Based on the technological characteristics of aircraft wing beam parts, the actual deformation data of the parts on the production site is computed, and the deformation trend, deformation amount and main influencing factors of beam parts are analyzed. The improved processing plan and processing deformation control method can reduce the deformation of beam parts. The results show that the flatness value of the parts in the process of machining can be effectively improved, and the deformation of beam parts can be significantly improved by the proposed method.