The invention relates to a polyethylene fiber-reinforced zeolite-fly ash-based geopolymer with an ultra-high molecular weight and a preparation method of the polyethylene fiber-reinforced zeolite-flyash-based geopolymer. The polyethylene fiber-reinforced zeolite-fly ash-based geopolymer comprises the following raw materials of: in parts by weight, 493-542 parts of low-calcium fly ash, 124-136 parts of high-calcium fly ash, 203 parts of quartz sand, 0-61 parts of zeolite, 160 parts of water, 38 parts of sodium hydroxide, 173 parts of sodium silicate and 5-50 parts of polyethylene fiber with anultra-high molecular weight, and the preparation method comprises the following steps of: adding the low-calcium fly ash, high-calcium fly ash, quartz sand and zeolite to a stirring pot, and performing even stirring to obtain a No.1 mixture; mixing the water, sodium hydroxide and sodium silicate evenly in a beaker to obtain an alkali activator, adding the alkali activator to the stirring pot so as to mix the alkali activator with the No.1 mixture to obtain a No.2 mixture, adding the polyethylene fiber with an ultra-high molecular weight to the No.2 mixture, performing stirring until the fiberis evenly dispersed, putting the obtained slurry into a mould, then performing curing in an oven, and then performing curing at room temperature so as to achieve molding. When the preparation methodis compared with the prior art, the product has the advantages of low cost, good material performance and the like.