The invention discloses an application method of a high-voltage cable head lineation cutting positioning device which is accurate and convenient to manufacture. The high-voltage cable head lineation cutting positioning device comprises a main ruler, wherein a main ruler clamping jaw is arranged at the left end of the main ruler, a positioning block is fixedly installed on the rear side of the main ruler clamping jaw, the right end face of the positioning block is flush with the right end face of the main ruler clamping jaw, and zero graduation standard positioning of the high-voltage cable head lineation cutting positioner is achieved due to the fact that the right end face of the positioning block is aligned to the left end face of a high-voltage cable head which needs to be measured; and a plurality of auxiliary rulers which can slide and conduct positioning on the main ruler are installed on the main ruler. According to the application method, the high-voltage cable head lineation cutting positioning device is provided with a plurality of verniers (auxiliary rulers), each vernier (auxiliary ruler) is fixed according to the manufacturing technological standard required sizes of cable terminals of various models before cutting and peeling the cables, lineating and positioning is achieved at one time according to the positions of the verniers (auxiliary rulers), the precision reaches 0.1mm, and cable sheathes, steel belt steel armors, copper shielding layers, semiconductive layers, main cable insulating layers and the like are peeled off layer by layer according to lineation positions.