The invention belongs to the field of materials, and provides a yellow-green fluorescent powder with a high luminous intensity and a wide emission range, wherein an activator does not need to be added, the fluorescent powder is self-luminous, and the luminous performance thereof is capable of depending on the inherent structure attributes thereof. The preparation method is simple, easy to operate, low in equipment cost and pollution-free. The chemical structure of the self-luminous yellow-green fluorescent powder is BaLuAlxZnyO7.