Provided is a method for preparing an EPVC paste resin hard highly-foamed board. The method comprises the steps that raw materials are selected according to a formula, all powdered raw materials are put into a kneading machine to be kneaded, and a solvent is added; the kneaded mixed material is subjected to a foaming reaction, after the reaction is completed, and a foamed board is taken out and put into a hot air circulation oven to reach a target foaming rate; the treated foamed board is sent into a drying room to be heated, and the solvent is removed; cutting machining and inspection are conducted according to requirements, and a finished product is obtained. According to the method for preparing the EPVC paste resin hard highly-foamed board, the hardness and foaming rate of the EPVC paste resin foamed board are greatly increased, and the problem that for existing domestic EPVC paste resin, a hard highly-foamed board material does not exist is solved.