The invention discloses a label code imprinting machine of a copper bar raw material. The label code imprinting machine comprises a main support, an upper pressing air cylinder, a lower ejector air cylinder, an imprinting upper module, an imprinting lower module and an imprinting device. An imprinting groove is formed in the imprinting lower module, an upper pressing strip is arranged on the lowerportion of the imprinting upper module, and the imprinting device is arranged in the imprinting lower module. The imprinting device comprises a magnetic flux wire winding framework, an extension spring, an iron core, a guide plastic rod, a driving ejector block, a carving plate mounting seat, a carving plate and a driven ejector block. A coil is wound around the magnetic flux wire winding framework. After the coil is powered on, a magnetic field is generated to attract and pull the iron core so as to carve and imprint a label code on the surface of the carving plate onto a copper bar. The invention further provides an imprinting method for imprinting the label code onto the copper bar. The imprinting method comprises the steps of feeding, discharging, label code imprinting and exhaust. According to the label code imprinting machine and the imprinting method, the work of imprinting the label code onto the copper bar can be completed automatically, the trouble of manual imprinting is omitted, a large quantity of manpower and material resources are saved, and the labor intensity of master workers is reduced.