The invention discloses a belt cutting machine, and relates to the field of conveyor belt machining. The belt cutting machine comprises a driving device, a cutting device and a control system, whereinthe driving device comprises a first roller and a driving motor; the driving motor is connected with a central shaft of the first roller, the cutting device and the driving device are arranged at intervals in the moving direction of a belt, the cutting device comprises a blade shaft, blades and a cutting motor, the axis of the blade shaft is parallel to the axis of the central shaft of the firstroller, the blades are connected to the blade shaft at intervals, and the cutting motor is connected with the blade shaft; and the control system comprises a main circuit and a control circuit, and isused for controlling the driving motor and the cutting motor. The belt cutting device has the advantages that the automation degree is high, the labor intensity is reduced, and the working efficiencyis improved.