Abstract: Coal flow control system based on CAN bus is designed according to common belt conveyor idling in actual production, especially long idling causes great waste of electricity. By adding energy saving control system and new type sensor, using energy-saving control algorithm, we minimize belt conveyer idling, and achieve energy saving effect. Through the configuration, it truly achieves opening belt conveyor as material transporting and closing belt conveyor without material transporting, and puts an end to inaction idling of belt conveyor. We adopt sensor to detect coal flow on belt conveyor, propose energy-saving algorithm, design and develop coal flow control matching with belt protection control device to prevent the idling of belt conveyor without material, which can effectively save electricity and reduce the transportation cost.