The invention relates to an annular discharging nozzle, which comprises an outer sleeve and an umbrella-shaped cap fixedly sleeved in the outer sleeve. The outer sleeve is of a tubular structure, and the lower portion of the outer sleeve is provided with a flared opening with both the inner diameter and the outer diameter gradually enlarged. The umbrella-shaped cap is of a rotary solid structure, the top of the umbrella-shaped cap is conical, the middle of the umbrella-shaped cap is cylindrical, the diameter of the lower portion of the umbrella-shaped cap is gradually increased, and then a diverging portion corresponding to the flared opening of the outer sleeve in shape is formed. A uniform annular cavity is formed between the outer sleeve and the umbrella-shaped cap, at least one of the outer sleeve and the umbrella-shaped cap is made of metal conducting materials, an annular closed angle is formed at the outer edge of the lower end of at least one of the outer sleeve and the umbrella-shaped cap, and the metal conducting materials are connected with a high-voltage output line of an electrostatic generator. As the nozzle adopts an 'annular' discharging mode, a high electrostatic field can be generated, powder coatings are not easy to be taken away when moving on a substrate at a high speed, deposition efficiency can be greatly improved, the nozzle is applicable to high-speed coating for coiled materials, and powder can be uniformly coated on the surface of the substrate to be coated.