Through the numerical simulation analysis of open-wall and non-opening light steel keel sandwich composite wall panel under plane load, the bending performance of light steel keel sandwich composite wall panel was studied, and the light steel keel was analyzed. The one-to-one correspondence between the deflection at the maximum deformation of the sandwich composite wall panel and the stress of the component and applied load was evaluated. The structural performance under normal load conditions was evaluated. On the basis of basic analysis model calculation, the influence of parameters such as square steel tube specification, the spacing of square steel pipes and the mechanical properties of the plates on the bending resistance of wall was analyzed, and the suitable wallboard specifications under different building heights and wind pressures were proposed.