The vortex nozzle with circumferential entered can effectively improve the inside fluid flow velocity of the nozzle and atomization effect of flow field.Aiming at the key parameters of vortex nozzle (jet pipe diameter, nozzle outlet diameter and jet pressure),the inside and outside flow fields of vortex nozzle were researched respectively by using the fluid dynamic software simulation and experimental test.The results show that the swirl nozzle upper center area pressure is low, the vortex improves the speed of internal nozzle flow; inside the vortex nozzle, with the increasing of jet pipe diameter, the flow velocity of nozzle axis increases,the nozzle inside jet speed along the axis direction show the changing rule of monotone increasing; atomized particle size D50 decreases with the increasing of jet pressure and jet pipe diameter; atomized particle size D50 increases with the increasing of nozzle outlet diameter. The best nozzle outlet diameter of 3 mm, jet pipe diameter of 4 mm are determined.