Cutter suction dredger usually works in floating state, and the working process is affected by loads obviously. The loads on cutter suction dredger are complicated during operation process. A cutter suction dredger is taken as research object, the wind and current load of cutter suction dredger are analyzed by using CFD numerical simulation, the dimensionless wind and current load coefficients are obtained, and the characteristics of the wind and current load of cutter suction dredger are summarized. The CFD simulation is processed based on mesh convergence test, so the validity can be assured. This work can be used for mooring analysis and operation safety analysis of cutter suction dredger.