The invention relates to a cutter suction dredger automatic conveying control method based on the output, and belongs to the technical field of engineering ship automation control. The method comprises the steps that the pipeline conveying critical flow rate is estimated through an estimator according to the current working condition at first, by controlling a cutter suction dredger conveying system, the transverse moving speed is adjusted automatically, the pipeline conveying flow rate is automatically controlled to be stable and is not lower than the pipeline conveying critical flow rate, and thus optimal delivery output is achieved. The pipeline conveying flow rate is controlled automatically by a flow rate controller and a transverse moving controller to be stable and is not lower thanthe pipeline conveying critical flow rate, optimal conveying output is achieved, the labor intensity of staff is relieved, the equipment safety is improved, output is increased, and the constructionefficiency is improved.