The invention relates to a metal bar cutting machine. The metal bar cutting machine comprises a case (1); the metal bar cutting machine is characterized in that a driving device (2) is arranged on oneside inside the case (1), a fixed frame (3) is fixedly connected to the end, on a main shaft, of the driving device (2), the fixed frame (3) is provided with a protrusion (4) which is provided with ajack post (41), a clamping mechanism (5) is movably connected to the jack post (41), the main shaft is provided with a cutter (6), and the clamping mechanism (5) is provided with a handle (51); a metal bar is clamped through the clamping mechanism (5), the hand-held handle (51) drives the clamping mechanism (5) to rotate by taking the jack post (41) as a fulcrum, and the metal bar is delivered tothe cutter (6) position for cutting. Accordingly, cutting is convenient, the safety coefficient in the cutting process is greatly increased, the cutting precision is good, the cutter and the drivingdevice are protected through a protection cover and a cutter cover, and the service life is prolonged.