The invention discloses a halogen-free flame-retardant resin composition, including polyethylene (PE), modified polyphenylene oxide (MPPO), hydrogenated styrene-butadiene block copolymer (SEBS) and a halogen-free flame retardant , a mixture of non-halogenated red phosphorus, nitrogen-based flame retardants and processing aids. During preparation, the mixture of polyethylene, modified polyphenylene ether, hydrogenated styrene-butadiene block copolymer, microencapsulated coated red phosphorus and nitrogen-based flame retardant is put into a high-speed mixer by weight %, dispersed and mixed Finally, it is melted, extruded, cooled, pelletized, dried and packaged by a twin-screw extruder. The mixture of the invention is suitable for the production of various soft and semi-hard products, such as: coverings for electric wires and cables, injection molded plugs for power cords, etc. The processing flow of the invention is simple and continuous, the production efficiency is high, the cost is low, and the product quality is stable. The product made by the composition of the invention has beautiful appearance, smooth surface and no precipitates.