The utility model discloses a cylindrical thin-wall file with metal etching ultramicro bulges, which comprises a core rod, a metal tube is fixedly sleeved on the core rod, and a plurality of etching bulge blocks are arranged on the outer side of the metal tube. The utility model has a simple structure, small convex points etched on the surface of the metal etching ultramicro convex cylindrical thin-wall file are small tool noses one by one; the sharpening and filing effects are good; small convex points etched on the surface of the metal etching ultramicro convex cylindrical thin-wall file arevery small; the diameter of each protruding point ranges from 0.02 mm to 0.08 mm. The height of the base plate is 0.02 mm-0. 10mm; so fine grinding, grinding depth micro, wherein the grinding depth is less than 0.1 mm each time; meanwhile, the metal etching ultramicro convex cylinder thin-wall file adopts a thin-wall cylinder structure, so that the weight is light; due to the fact that the surface hardness of the adopted metal material can reach HV800 or above after heat treatment, the abrasion resistance is greatly improved, the service life of the barrel thin-wall file is prolonged, and meanwhile when the barrel thin-wall file is used, the movable rod is pulled out, so that the barrel thin-wall file is conveniently used by workers and is convenient to use.