Method for producing wood-plastic composite material

The invention relates to a method for preparing wood-plastic composite materials. The method comprises the following steps: 1) thoroughly mixing 50-100 weight parts of wood powder with 40-200 weight parts of fillers with a high-speed mixer, adding 1-20 weight parts of finishing agents into the high-speed mixer, and stirring at 80-120 DEG C for 10-20 min; 2) adding 10-20 weight parts of addition agents in the resulting powder mixture, stirring for 3-6 min to allow uniform dispersion; 3) delivering the resulting mixture produced in the step 2) to a fluidized bed dryer for drying until the water content is below 3%, granulating by using a ring mould pellet mill to obtain pressed pellets; and 4) mixing resin granules with pellets at a weight ratio of 1:(1-2) and extrusion-molding to obtain the final product. The preparation method is implemented by pressing and pelletizing wood powder, mixing wood pellets with plastic granules and conducting extrusion processing, overcomes material feeding difficulties, and can double the yield and increase production capacity.