The invention relates to a quasi melting static mixing method for producing a single polymer composite material product and belongs to the field of forming and processing of a polymer composite material. The quasi melting static mixing method comprises the following steps that a matrix material is molten and plastified through conventional polymer processing equipment, keeps a melting state, enters a main body through a thermal insulation slab and a splitter plate under the action of pressure, and is rapidly cooled to the quasi melting state from the melting state under the action of the thermal insulation slab, the splitter plate, the main body and a rapid cooling device; a fiber reinforcement material enters the main body through a fiber feeding device; under the action of pressure, thefiber reinforcement material and the matrix material in the quasi melting state enter a static mixing device together; the temperature of the static mixing device is kept below the melting temperature of the matrix material through a temperature control device; under the action of a static mixing element, the matrix material and the fiber reinforcement material are mixed uniformly; and finally, under the action of pressure, the mixture is extruded out of equipment to form the product. In the invention, excellent interfacial bond property and superior recycling performance of a single polymer composite material are played in a large range.