Optoelectronic chips are important for complex information conversion in the age of artificial intelligence. The highest efficiency of electron-photon conversion is achieved through strongly coupled electron-photon states, particularly using the degree of freedom of electron spin has unique advantages. Collective excitations of spin can form magnons, which have unique merits such as long lifetimes and immunity to Joule heating. These advantages can be combined through the strong coupling between magnons and high-speed photons to form “cavity-magnon polariton (CMP).” Recent progresses have focused on constructing high cooperative CMP, controlling radiation and transmission of CMP, understanding the perfect absorption mechanism of CMP, and developing electrical tuning and logical operation functions of on-chip CMP prototype devices. These studies on the coherent coupling dynamics of CMP are expected to promote the development of low-loss optoelectronic devices and the cutting-edge information processing technology.