The situation that the cutter suction dredger is influenced in the operation process by the loads is complicated. Taken a cutter suction dredger as the research object, the wind load and current load of cutter suction dredger are analyzed with the numerical simulation model of Computational Fluid Dynamics (CFD), the dimensionless coefficients of wind load and current load are obtained, and the law of wind load and current load of cutter suction dredger is summarized. The research results can provide certain reference for mooring analysis and operation process security analysis of cutter suction dredger.