Objective： It solves the problems of large water consumption and poor cleaning effect existing in the traditional cleaning method of mussels. Methods： The geometric models of Axial fan-nozzle with different structural parameters were established by Solidworks software. After setting the parameters in fluent software, the velocity and water content of the internal and external flow fields of the jet were numerically calculated. Results： The larger the spray angle of the nozzle was, the faster the decay velocity of the flow field of the jet was, and the lower the water content was. The larger the equivalent diameter of the nozzle was, the slower the velocity decay of the jet flow field and the higher the water content was. If the jet target distance was too large or too small, the velocity uniformity of the outer jet in the XY plane would be affected. Conclusion: The axial fan-shaped nozzle with a jet angle of 65° and an equivalent diameter of 2 mm is more suitable for jet cleaning of mussel shells when the jet pressure is 11 MPa and the target distance is 90 mm.