The invention relates to a preparation technology of wood-plastic composite materials and particularly relates to a method of preparing a wood-plastic
composite material with modified wood
powder and waste plastic. The method includes the steps of (1) crushing, milling and
drying agricultural and
forestry wastes, successively adding three different surface modifiers and successively mixing the surface modifiers with the waste
powder in a high-speed mixing
machine to prepare a modified waste
powder; (2) cleaning the waste plastic, crushing the waste plastic into granules being 2-12 mm in size, and
drying the granules; and (3) according to weight percentage ratio, feeding a mixture composed of the modified waste powder, the waste plastic granules, a
lubricant, a foamer and a foamer aid into the high-speed mixing
machine to perform high-speed mixing, cooling the mixture until the temperature is lower than 55 DEG C and discharging the material to prepare a special premix. The
composite material is very high in strength and anti-bending and anti-
impact performance, wherein the anti-
impact strength is significantly improved so that the
composite material is greatly improved in processability, and further can be used for producing products satisfying different demands. The composite material is greatly wide in application range.