Cutting chain of mining chain arm saw

The utility model provides a cutting chain of a mining chain arm saw. The cutting chain comprises a plurality of groups of circulating joints, each group of circulating joints comprises a chain plate component, a single-blade component and a double-blade component; the single-tool component comprises a plurality of single-tool units which are sequentially arranged in the length direction of the chain plate component; the double-blade component comprises a plurality of double-blade units which are sequentially arranged in the length direction of the chain plate component, and the first double-blade unit is adjacent to the last single-blade unit in the single-blade component; the cutting faces of the tool bits in the single-tool units and the cutting faces of the tool bits in the double-tool units are obliquely arranged at the same acute angle relative to the length direction of the chain plate component, and the highest cutting points of the cutting faces of the tool bits are sequentially lowered in the arrang