The invention provides a composite rotating extrusion strengthening device based on micro-bulge points and coatings. The composite rotating extrusion strengthening device based on the micro-bulge points and the coatings comprises a core rod and a sleeve slidably sleeving the core rod, wherein the core rod comprises a tapered cylinder; a layer of first coating is coated on the outer surface of thecore rod; the sleeve is provided with an outer wall; a spiral through slot is formed in the outer wall; tightly distributed and regular spherical bulges are arranged on the outer surface of a side wall; and a layer of second coating is coated on the surface of each spherical bulge. The invention further provides a composite rotating extrusion strengthening process based on the micro-bulge points and the coatings. The composite rotating extrusion strengthening device based on the micro-bulge points and the coatings provided by the invention comprises the core rod with the tapered cylinder, anda tapered through hole matched with the core rod, so that the sleeve can favorably align at the core rod; meanwhile, when the core rod extrudes along the radial direction of the hole, the stress distribution is uniform; and the spiral through slot is formed in the surface of the sleeve of the device, so that on one hand, during extrusion, the stress distribution is uniform, and on the other hand,a rotation process can be favorably carried out.