To provide an engraving method of intaglio drawing line in which an original line drawing image manufactured on a base material is generated into the engraving data for an NC machine tool, and the intaglio printing line having the sectional shape and the thickness stop shape of the correct depth and the desired drawing line is faithfully engraved to the original line drawing image.

The line drawing pattern depicted on a base material such as paper is image-input into the bit map data by using an image input equipment, the vector data type line drawing data is formed by performing the image processing of the contour tracing or the like to the bit map data, and contraction is performed for the line drawing data a plurality of times to produce the cutter path for an NC machine tool. The text processing to give the desired depth or the like is performed for each produced cutter path. The engraving data for the four-axis controlled NC machine tool is produced thereby. An intaglio line-formed body is engraved by using a plurality of engraving cutting tools of different tip shape on a base material such as metal based on the data.