The invention provides a durable and hardly-deformable polyethylene wood-plastic composite. The hardly-deformable polyethylene wood-plastic composite comprises the following components: by weight, 100-150 parts of high density polyethylene, 30-40 parts of polyvinyl chloride, 10-20 parts of chlorinated polyethylene modified polyvinyl chloride, 10-20 parts of an epoxy resin, 5-10 parts of coumatone resin, 3-6 parts of butyl rubber, 5-10 parts of polyacrylamide, 5-10 parts of boric acid alkylolamide, 2-4 parts of dioctyl sebacate, 10-12 parts of tricresyl phosphate, 3-8 parts of polyester imides, 10-20 parts of epoxidized soybean oil, 5-10 parts of vaseline , 10-15 parts of polyvinylbutyral resin, 50-80 parts of a wood flour, 10-20 parts of zinc oxide, 10-15 parts of figuline, 5-10 parts of lithopone, 3-15 parts of calcium carbonate and 5-8 parts of a glass fiber. The hardly-deformable polyethylene wood-plastic composite has the advantages of good mechanical properties, hydroscopicity of 0.3% or less, tensile strength of 15MPa or more, and heat deformation temperature of 115DEG C or above. After destruction by high temperature and high humidity, deformation rate of the hardly-deformable polyethylene wood-plastic composite is less than that of contrast products.