Abstract: Ethylene-vinyl acetate copolymer (EVA) and polyethylene (PE) were melting blended for preparing PE-based low-smoke halogen-free flame-retardant composites, furthermore, the effects of EVA content on the structure and properties of the composites were studied. The results showed that inorganic filler networks were promoted in material due to the good compatibility between EVA and PE, which can limit the movement of molecular chains and enhanced the thermal decomposition temperature and solid-like behavior of the material. It can also improve the density and uniformity of the carbon layer and inhibit the dripping of the material during combustion. The elongation at break and limiting oxygen index (LOI) of the composite were 612% and 26.4% with the mass fraction of EVA reaching 15%, which had excellent comprehensive performance.