The invention discloses a casting cutting machine, which comprises a cutting machine body, the cutting machine body is provided with a transmission groove, the upper side wall of one side of the transmission groove is provided with a blanking port, and the side wall of the transmission groove is fixedly connected with a material guide plate arranged at an angle , the upper side wall of the transmission slot is provided with a rectangular slot, the side wall of the rectangular slot is fixedly connected with a limiting plate, the limiting plate is fixedly connected with a motor, the output end of the motor is fixedly connected with a rotating shaft, and the bottom side wall of the rectangular slot is provided with a horizontal slot, The end of the shaft is connected with a positioning block through a transmission mechanism, and the side walls on both sides of the positioning block are fixedly connected with connecting plates, and the connecting plate is provided with a linkage mechanism. A cooling mechanism is provided at the bottom end of the block. The positioning block of the present invention can drive the resisting plate to move upward when the cutting knife is cutting, thereby blocking the casting, allowing the cutting knife to cut the casting better, effectively improving the quality of casting cutting, and facilitating subsequent processing .