The invention discloses a soft/hard/soft multi-layer protective plate and a manufacturing method thereof, and relates to the field of manufacturing for multi-layer protective plates. According to thesoft/hard/soft multi-layer protective plate and the manufacturing method thereof, the technical problems that existing single-layer alloy plates have low conventional mechanical properties, the welding performance is poor, and the elasticity of the material is weak are solved. The soft/hard/soft multi-layer protective plate is A/B/C/B/A five-layer aluminum plate structure, wherein the thickness ratio of each layer of the A/B/C/B/A is as follows of (10-15) : (0.8-1.5) : (70-80) : (0.8-1.5) : (10-15); and the method comprises the following steps that 1, preparing an A-layer cast ingot; 2, preparing a B-layer cast ingot; 3, preparing a C-layer cast ingot; 4, carrying out hot rolling on clad plates; 5, welding and rolling A/B double-layer metal plate; 6, welding and rolling A/B/C/B/A multi-layer metal plate; and 7, quenching; straightening and aging. According to the soft/hard/soft multi-layer protective plate and the manufacturing method thereof, the heat treatment system is optimized, sothat the conventional mechanical property, the welding performance and the anti-elasticity performance of the material are superior to those of a single-layer alloy, and the multi-layer protective plate has good welding performance. The method is used for preparing the soft/hard/soft multi-layer protective plate.