Step 1), melting in parts by weight 10 parts of paraffin and adding with 0.7 parts to 1.5 parts of an electromagnetic wave absorbent, stirring evenly and thoroughly to obtain molten solution S1, wherein the electromagnetic wave absorbent is a combination of a carbon black and one or more of a ferroferric oxide-intercalated graphene oxide and a nano ferroferric oxide;

Step 2), melting 1 part of a high-molecular polymer, subsequently adding the high-molecular polymer into the molten solution S1, stirring thoroughly and evenly and then drying to obtain a core material S2, wherein the high-molecular polymer is one or more of a polyethylene, a polypropylene and an ethylene-vinyl acetate;

Step 3), dissolving polyacrylonitrile into a N, N-dimethylacetamide, stirring evenly and standing still, to obtain an external phase spinning solution; and

Step 4), taking the core material S2 as the core material and taking the external phase spinning solution as a skin material for solution spinning, to obtain the skin-core structure fibers with both infrared and radar stealth.