The utility model discloses a trichogramma releasing device. The trichogramma releasing device is of a hollow structure, and the cross section of the trichogramma releasing device is a square. A hanging band is fixedly arranged on one side face of the square, trichogramma outlets are formed in the upper half portions of the two fixed side faces of the square respectively, and one side face of the square is designed to be a movable opening cover. According to the trichogramma releasing device, the hanging paper band which is connected to a square paper box and provided with insertion openings in the two ends replaces a hanging line, and the movable opening cover serves as an opening cover, so that the trichogramma releasing device is manufactured and used conveniently and rapidly.