The invention discloses a heavy crosslinking plastic door and window. The heavy crosslinking plastic door and window is composed of, by weight, 0.1-0.2 part of dicumyl peroxide, 340-370 parts of polyvinyl chloride, 60-70 parts of a 20%-30% sodium hydroxide solution, 36-40 parts of benzyl chloride, 40-42 parts of divinylbenzene, 70-80 parts of styrene, 0.3-0.6 part of benzoyl peroxide, 1-2 parts of sodium alkyl benzene sulfonate, 1-3 parts of sodium sulfaquinoxaline, 4-5 parts of maleic anhydride, 2-3 parts of locust bean gum, 4-6 parts of potassium silicate, 2-4 parts of hexamethylphosphoric triamide, 3-5 parts of magnesium hydrate, 7-10 parts of EBST and 47-50 parts of heavy calcium carbonate. According to the heavy crosslinking plastic door and window, sisal fibers are subjected to freezing and swelling processing, so that the dispersity of cellulose is improved, and the accessibility of benzyl chloride to the cellulose is improved; the number of hydroxide radicals is decreased after etherification treatment, the crystalline texture of the cellulose is destroyed, and thermoplasticity is achieved; and fiber dimension stability, weather resistance, corrosion resistance and the like are all correspondingly improved.