The invention embodiment discloses a PVC (Polyvinyl Chloride) co-extruded sheet and a production method thereof, and belongs to the technical field of composite materials. The PVC co-extruded sheet comprises a PVC surface layer and a PVC foamed filling layer, wherein the PVC surface layer is prepared from PVC resin, CPVC powder, PBO fibers, a stabilizer, a fire retardant and ground calcium carbonate powder; the PVC foamed filling layer is prepared from the PVC resin, the CPVC powder, the PBO fibers, the stabilizer, the fire retardant, the ground calcium carbonate powder, an impact modifier, talcum powder, an internal lubricant, oxidized polyethlene wax, magnesium oxide, a silane coupling agent, a foam regulator, an ultraviolet light absorber, an antioxidant and an antistatic agent. The PVCco-extruded sheet in the embodiment of the invention has good mechanical property, weather resistance and good promotion value, so that the limitations of an existing PVC foaming material used outdoors are overcome, the cost of outdoor landscape engineering is greatly reduced and further the use field of products is widened.