The invention relates to the technical field of metal grooving devices, in particular to a metal grooving device. The metal grooving device comprises a bottom plate and further comprises a second rackclamped to the other side of the upper end of the bottom plate, a carrying frame clamped to the upper end of the bottom plate and a grooving part connected to the upper end of the second rack in a screwed mode and located on the upper side of the carrying frame. The grooving part comprises a case, a cross beam arranged on the case in a penetrating mode, fixed plates arranged on the cross beam ina sleeving mode and clamped to the side walls of the case, a motor fixed in the case through a bolt, an output shaft, a cutterhead clamped to the lower end of the output shaft, and a cutting knife clamped to the lower side of the cutterhead, wherein the output shaft is arranged on the lower portion of the case in a penetrating mode, and the upper end of the output shaft is connected to the motor in a screwed mode.