The invention relates to a halogen-free flame retardant polyethylene cable material and a preparation method thereof. The cable material is characterized by being made of the following raw materials by weight part: 34-36 of high density polyethylene, 12-14 of linear low density polyethylene, 3-4 of zirconium diboride, 2-3 of titanium diboride, 12-14 of an ethylene-methyl acrylate copolymer (EMA 1209AC), 45-48 of attapulgite, 24-26 of sepiolite, 1-2 of an ECHO.A thiadiazole derivative, 3-4 of zinc stearate, 1-2 of an accelerator DTDM, 1-2 of an anti-aging agent OD, 5-8 of stearic acid monoglyceride butyral, 2-3 of N-2-(aminoethyl)-3-aminopropyl trimethoxysilane, 2-3 of isopropyl distearoyloxy aluminate, 1-2 of an antioxidant DSTP, 1-2 of diphenylamine, 4-6 of didodecanol ester, 5-8 of butadiene, 12-14 of zinc borate, and 6-8 of modified diatomite. The ethylene-methyl acrylate copolymer involved in the invention has excellent adhesiveness, and the strength of the cable material is greatly improved. The cable material provided in the invention has the advantages of high temperature resistance, halogen-free and flame retardant properties, high oxygen index, good heat and sound insulation, and strong impact load absorption ability, etc.