Material level balance control method and system

The invention provides a material level balance control method and system for silos. The method comprises the following steps: starting one of a plurality of belt conveyors and all or part of feeding machines corresponding to the belt conveyor; utilizing a belt weigher on the started belt conveyor to measure the material flow rate on the belt conveyor; and stopping the started belt conveyor and the feeding machines corresponding to the belt conveyor according to the measurement result of the material flow rate or when the running time of the belt conveyor exceeds a first preset time, and starting another belt conveyor in the plurality of belt conveyors, which is different from the belt conveyor in use, and all or part of feeding machines corresponding to the another belt conveyor. Through the above technical scheme, the belt weighers are used for detecting the material flow rate, and whether the belt conveyors are to be switched or not is determined according to the detected material flow rate, so that the material level can be timely adjusted when the material levels in the silos are unbalanced, and the safety and stability in the whole discharge process are ensured while the operation is not influenced.