Abstract: The Curved double Steel plate sandwich Composite Wallboard structure has the same force transmit mechanism as the arch structures which can make full use of the excellent compressive strength of concrete, and greatly improve the bearing capacity of the structure. In this study, the experimental study of L-shaped Curved double steel plate composite wallboard (L-CDSCW) is carried out under near-field explosion. The anti-blast performance of the L-CDSCW is investigated through damage analysis and structural deformation analysis. Numerical simulation of the L-CDSCW is conducted by using LS-DYNA, and the influences of the different key parameters on the blast resistance of the L-CDSCW specimens are analyzed. The results show that no collapse phenomenon occurs in the L-CDSCW under the action of near-field explosion, and the specimens have strong anti-explosion performance. The mid-span deformation and plastic failure of concrete reduce with the increase of the thickness of the steel plate. Simultaneously, the maximum mid-span deflection of bottom steel plate significantly increases with the increase of the TNT charge and decrease of the explosion distance, which can also increase the depth of concavity of the mid-span concrete and aggravate the concrete damage. This study can provide technical reference for the application of CDSCW.