Method and device for forming protrusion by masking on surface of basic material

The present invention relates to a method and a device for forming a protrusion by masking and, more specifically, to a method for forming a protrusion by masking, comprising: a mask formation step for forming a mask layer on a basic material; an etching step for etching an area in which a mask is not formed on the basic material; and a mask removal step for removing the mask layer, wherein the mask formation step comprises: a step for forming at least one small mask; and a step for forming at least one big mask.