The invention discloses an arc striking needle adjusting device of arc ion plating. The arc striking needle adjusting device of the arc ion plating comprises a main rod, an outer sleeve barrel, a spring, an adjusting stud and an arc striking needle. An internal thread hole used for mounting the adjusting stud is formed in one end of the main rod and the adjusting stud is mounted in the internal thread hole. A step structure used for mounting the spring is arranged on the main rod and the outer sleeve barrel is arranged on the main rod in a sliding and sleeving manner. The spring is mounted onthe step structure of the main rod in the outer sleeve barrel. An elastic force along the axial direction of the main rod and toward the adjusting stud end is supplied to the outer sleeve barrel by the spring. A section of through groove is formed in the hole wall of the internal thread hole of the main rod and a vertical section of the arc striking needle is mounted in the through groove. The arcstriking needle is clamped and fixed between the outer sleeve barrel and the adjusting stud under the action of the spring elastic force. When the distance between the arc striking needle and a target surface needs to be adjusted, the adjusting stud pushes the arc striking needle to slide along the through groove in the length direction by rotating the adjusting stud, and the arc striking needledrives the outer sleeve barrel to make the spring be compressed, so that continuous adjusting of the position of the arc striking needle can be realized.