The invention relates to a precise polyvinyl chloride (PVC) high-calcium fill metering and feeding device of a conical twin-screw extruder. The device comprises a storage device, a feeding device and a stirring device, wherein the storage device consists of a feeding hopper and a hopper cover arranged at the upper part of the feeding hopper; the feeding device comprises a feeding barrel, a driving motor, a motor connecting plate, a motor connecting body, a feeding screw rod, a first bearing seat, a deep groove ball bearing, a bearing check ring, a felt ring and a bearing cover; the stirring device comprises a stirring body, a stirring shaft, a second bearing seat, a shaft sleeve, a sprocket chain and a sprocket cover. Compared with the prior art, the precise PVC high-calcium fill metering and feeding device has the advantages of easiness in blanking, accuracy in feeding, simple and attractive structure, high conveying capacity, no fluctuation, good self-cleaning performance, high metering precision, wide application scope, etc.