The invention relates to a wood plastic starch composite material and a preparation method thereof. The wood plastic starch composite material is prepared by mixing base materials, an additive aluminium titanium composite coupling agent, glycerol, an antioxidant 1,010 and a lubricant zinc stearate, wherein the base materials comprise 40 to 65 weight percent of recycled corrugated paper fiber, 10 to 40 weight percent of low-density polyvinyl resin and 10 to 30 weight percent of starch; the using amount of the additive aluminium titanium composite coupling agent is 1 to 6 weight percent of the recycled corrugated paper fiber content; the glycerol content is 5 to 15 weight percent of the starch content; the antioxidant 1,010 content is 0.5 to 2 percent of the total weight of the base materials; and the weight of the lubricant zinc stearate is 1 to 4 percent of the total weight of the base materials. The wood plastic starch composite material has high recycled corrugated paper fiber content, low cost, high physical and mechanical strength, high surface finishment, water resistance and chemical corrosion resistance, is susceptible to degradation, and is a new environmentally-friendly wood-plastic product.