Solid oxygen grain capable of improving stability of oxygen release rate, preparation method of solid oxygen grain and solid oxygen generator

The invention discloses a solid oxygen grain capable of improving oxygen release rate stability, a preparation method of the solid oxygen grain and a solid oxygen generator, and belongs to the technical field of chemical oxygen production. The solid oxygen grain consists of the following components in percentage by mass: 86.0 to 95.0 percent of sodium chlorate, 2.5 to 5.0 percent of potassium perchlorate, 2.0 to 4.0 percent of catalyst and 0.5 to 5.0 percent of ceramic fiber. Mixing the raw materials and performing compression molding; by properly increasing the content of potassium perchlorate and adopting a proper fiber binder, the weight and the volume of the solid oxygen source oxygen generator are not increased on the premise of keeping the minimum component types; under the condition that no phase change material is used and the structure of the solid oxygen grain is not changed, the effect of stabilizing the temperature of a chemical reaction area is achieved, and then the stability of the oxygen relea