The invention specifically relates to a copper rod, belonging to the technical field of copper rods. The copper rod comprises a copper cover, antiskid lines, a copper round rod, a finger pressing plate, a round copper plate, a round copper block, crosshead bolts, a square-mouth through hole, a reset spring, a square-mouth groove, a rectangular guide block, a movable pin, a first torsion spring, acolumn groove, a threaded hole, a second torsion spring, a shaft rod and a single-groove copper wheel. The copper rod is reasonable in design, and glass cutter heads with connecting structures of different specifications and sizes can be fixedly connected by adjusting the distances among the three crosshead bolts, so the function of knocking a to-be-cut plate structure in a reciprocating manner via a glass tool bit is realized, and scrapped plate structures at one sides of scratches can be conveniently knock off; and a thin wire which is wound on the single-groove copper wheel and soaked withprinting ink is pulled out of the copper cover to approach the surface of a corresponding structure in a linear mode, then two ends of the thin wire are fixed, and the thin wire is loosened and pulledupwards for snapping of the thin wire, so the auxiliary function of drawing a straight line on the surface of the corresponding structure is achieved.