In order to optimize the processing parameters of mussel shucking devices, based on the key technology and the system of automatic water jet half-shelling equipment, a three-dimensional solid model of water jet from a nozzle outlet striking the mussel was established. The VOF two-phase turbulence model of Fluent software was used to simulate the striking process of water jet from the nozzle to the mussel. The velocity and temperature of the water jet at the nozzle inlet, the relative horizontal positions between the nozzle outlet and the distance point (Axis AB), the velocity distribution on the vertical line of the distance point, and the tilt Angle of the mussel were studied respectively, and the outdoor verification test was carried out. The results show that a maximum velocity of 400 m/s was reached when the nozzle inlet temperature was 40℃, inlet velocity 110 m/s, mussel tilt Angle 14° and the outlet velocity of the nozzle was 6.5 cm away from the mussel. On the vertical line (in the Y direction) of the distance point, the velocity was symmetrically distributed, and the closer to the AB axis, the greater the velocity was, and the maximum velocity could reach 424 m/s. The simulation results were compared with the model performance experiment results, indicating that the data simulation and test results were in reasonable agreement under optimal working conditions, which not only guaranteed the high integrity of mussel flesh after shucking, but also maximized water jet velocity and improved shelling efficiency.