The invention specifically discloses a co-extrusion type highly-flame-retardant hot melt adhesive. The co-extrusion type highly-flame-retardant hot melt adhesive comprises the following components inpercentages by mass: 30% to 50% of an ethylene-vinyl acetate copolymer, 15% to 30% of viscosifying resin, 2% to 6% of an adhesion modifier, 25% to 40% of a highly-efficient composite flame retardant and 0.5% to 2.0% of a heat oxidation stabilizer. The co-extrusion type highly-flame-retardant hot melt adhesive provided by the invention has the advantages of good flame retardancy, adhesion performance, mechanical properties and insulation performance, excellent comprehensive performance, etc., can be applied to preparation of high-end completely-flame-retardant high-temperature-resistant double-wall tubes, and is applied to the industries of aviation, ships, electronic information equipment, nuclear energy, photovoltaics, etc.