The invention provides an apparatus for closed feeding precision control. The apparatus is provided with a feeding precision control device that comprises an attachment joint and a medical silicone flexible coupling connected to the attachment joint. Moderate feeding control cylinders, exact feeding control cylinders and shaking feeding cylinders, which are all connected to the control device, are disposed in order from top to bottom outside the medical silicone flexible coupling. Polyformaldehyde clamping plates are disposed at positions, facing the medical silicone flexible coupling, of the three groups of cylinders. The apparatus for closed feeding precision control is capable of realizing metered and proportioned delivery of a plurality of materials, and has the characteristics of accurate metering, high speed, no abrasion to materials, no powder falling, no layering, and high metering precision. Further, the apparatus has the advantages of high automation degree, simple operation, environmental protection and hygiene, accurate feeding, and high proportioning precision. With an automatic control center, a full view of the whole production process can be obtained to allow effective control on the operation procedure and efficient elimination of errors possibly caused by manual operation.