The invention discloses a releasing device which is integrally a hollow sphere and is divided into an upper hemisphere and a lower hemisphere. The upper hemisphere and the lower hemisphere are connected into a whole sphere, an egg storage tube is arranged on the center line of the sphere, the lower end of the egg storage tube is connected with the lower hemisphere, a gap is reserved between the upper end and the inner surface of the upper hemisphere, the upper end of the egg storage tube is opened, a releasing port is formed in the upper hemisphere, and the center of gravity of the whole releasing device is located at the bottom of the egg storage tube. A retaining ring is arranged around the releasing port and provided with a water draining port. The releasing device is used for releasingbeneficial insects in pest control, particularly has a good effect on large-area release of an unmanned aerial vehicle, and ensures the survival rate of the beneficial insects while quick large-areareleasing of the beneficial insects.