Flame-retardant PVC composite material and preparation method thereof

The invention discloses a flame-retardant PVC composite material and a preparation method thereof, and belongs to the technical field of PVC materials, the flame-retardant PVC composite material comprises the following raw materials by weight: 100 parts of PVC resin, 40-60 parts of ACR resin, 15-20 parts of a flame retardant, 8-12 parts of modified calcium carbonate, 2-3 parts of a heat stabilizer, and 1-2 parts of a lubricant; mixing the PVC resin, the ACR resin, the plasticizer, the flame retardant and the heat stabilizer, adding the lubricant, heating and kneading; and putting the kneaded material into a double-screw extruder, and carrying out extrusion granulation, so as to obtain the PVC composite material. The ACR resin is used as a main impact modifier, so that the toughness of the PVC material can be effectively improved; the self-made flame retardant is used as an additive, so that the PVC material is endowed with uniform and efficient flame-retardant and anti-aging properties; the obtained PVC mater