In order to improve the efficiency and safety of 3PE anti-corrosive coating removal, a kind of axial fan nozzle is designed to produce fan-shaped abrasive water jet to remove 3PE anti-corrosive coating. Physical model of axial fan nozzle and computation model of abrasive water jet flow field produced by axial fan nozzle is established. Based on the software of FLUENT, numerical simulation of flow field characteristic of abrasive water jet internal and outside of axial fan nozzle is carried out with the particle trajectory model, and realizable k-ε turbulence model. The simulation results show that along the flow direction abrasive particle velocity increases obviously in the convergent segment of axial fan nozzle near column segment and increases very slowly in the column segment of axial fan nozzle. And abrasive particle velocity increases totally because of the reduction of nozzle circulation area or the change of runner shape caused by the existence of V-groove from the entrance of elliptical section of fan nozzle to the exit of nozzle, but it shows a complex distribution law. And there are two high-speed zones on the jet edge. It decreases in the external flow field of axial fan nozzle. The abrasive particle velocity nephogram appears bifurcation phenomenon after a certain position of X-axis, and it appears blank in some areas behind the bifurcation point meaning that there is no abrasive particle in these areas. In order to give full play to the excellent erosion effect of abrasive particle on the 3PE anti-corrosive coating, the target distance should be controlled before the bifurcation point when the fan-shaped abrasive water jet is used to remove the 3PE anti-corrosive coating. Secondly, for the fan-shaped abrasive water jet produced by the axial fan nozzle with different structural parameters, the position of bifurcation point of abrasive particle velocity nephogram is different. Considering the influences of the abrasive particle velocity, the range of action of abrasive particle and bifurcation position, the optimum structure parameter of axial fan nozzle intended to produce fan-shaped abrasive water jet for the removal of 3PE anti-corrosive coating is as follows:α2/r =1, α=15°, b=0.6 mm, d=2.13 mm. And its theoretical optimum target distance is between 17.37 mm and 37.37 mm.