The invention discloses a leveling control method and a leveling control system for a working hopper of an overhead working truck. The leveling control method comprises the following steps: acquiring the dip angle information of the working hopper; outputting the current leveling control information according to the dip angle information and leveling control rules preset; and when the preset standard corresponding relationship of the dip angle information and the leveling control information includes the corresponding relationship of the dip angle information and the leveling control information, leveling the working hopper according to the current leveling control information, otherwise, outputting control information for forbidding the leveling, and forbidding the leveling of the working hopper. Compared with the prior art, the method and system provided in the technical scheme of the invention has the following advantages: the software and the hardware of a system can be judged whether to be abnormal or failed in a timely and comprehensive manner, and when the software and the hardware of the system are abnormal or failed, the leveling of the working hopper can be stopped in a timely manner, so that the safety and reliability of the leveling control system are improved greatly.