Abstract: In order to improve the water jet atomization efficiency of the nozzle used in mine atomization for dust removal, an efficient atomization nozzle combined with self-excited oscillation was designed, and its key parameters were optimized by numerical simulation. The results show that: when the fluid passes through the channel, the velocity presents a laminar distribution characteristic, forming a vortex flow field in the nozzle cavity, and the nozzle velocity reaches more than 100 m/s in the front area near the resonant cavity. When ultrasonic wave and self-excited oscillation wave interact together, the optimal turbulence disturbance effect is achieved in the nozzle, and the better atomization effect is obtained. When the angle becomes smaller, a larger volume of the inner cavity is obtained, which is within the collision wall angle range of 60° to 70°. The vortex forms a filling state on the inner cavity of the nozzle to obtain a more obvious turbulence effect. When the resonator reaches the depth of 3 mm, the optimal injection effect is achieved, and the shock wave is significantly enhanced. With the increase of cavity depth, the turbulent kinetic energy decreases monotonically. At a larger cavity depth, the turbulent kinetic energy is increased and the turbulent effect is stronger.