The invention relates to a self-oscillation pulse jet atomization device. The rear end of an upper nozzle is in fixed fit with the front end of an oscillation cavity. The rear end of the oscillation cavity is in fixed fit with the front end of a lower nozzle. The front end of the upper nozzle is provided with a cylindrical input hole. The rear end of the upper nozzle is provided with a needle-shaped hole. A conical hole is formed in the upper nozzle. An oscillation chamber is arranged in the oscillation cavity. The front end of the lower nozzle is provided with a circular truncate cone protrusion. The circular truncate cone protrusion and the lower nozzle are of an integrated structure. The circular truncate cone protrusion is located on the outlet section in the oscillation chamber. An atomization small end inlet is formed in the circular truncate cone protrusion. The rear end of the lower nozzle is provided with an atomization large end outlet. An arc transition section through hole is formed in the lower nozzle. The atomization small end inlet communicates with the atomization large end outlet through the arc transition section through hole. The needle-shaped hole of the upper nozzle communicates with the input end of the oscillation chamber of the oscillation cavity. The atomization small end inlet of the lower nozzle communicated with the output end of the oscillation chamber of the oscillation cavity, and the atomization large end outlet of the lower nozzle is provided with a fan. The quality of outlet fog droplets can be improved.