The invention discloses an automatic skewering machine and a working method thereof. The automatic skewering machine comprises a meat loaf transfer mechanism, a meat loaf forming mechanism connected with the meat loaf transfer mechanism, a skewer puncturing control mechanism and an unloading mechanism, wherein the skewer puncturing control mechanism and the unloading mechanism are located below the meat loaf forming mechanism; the meat loaf transfer mechanism is provided with an upper transfer belt used for conveying meat loaves, the upper transfer belt is fixed to an upper transfer support, and a plurality of lifting devices are symmetrically fixed to the positions, on the two sides of the upper transfer belt, on the upper transfer support; and a plurality of meat cutting hobs are evenlyarranged on rotary shafts between the symmetrically-arranged lifting devices, the lifting devices are provided with adjusting handles for adjusting the heights of the meat cutting hobs, and the adjusting handles control pulleys connected with the rotary shafts to move in lifting sliding rails. The arranged lifting devices adjust the heights of the meat cutting hobs according to different demands and different meat products, adhering and winding of meat lumps to the meat cutting hobs are avoided, and meanwhile different skewer puncturing boxes are selected according to the different meat products; and the automatic skewering machine is high in automation and suitable for skewering of various kabobs, energy is saved, and manpower and material resources are saved.