The invention relates to an encapsulation particle and in particular relates to a neutron poison encapsulation particle with hot adhesion characteristics. The neutron poison encapsulation particle has a multi-layer shell structure, wherein a particle surface layer which can be shrunk and broken at high temperature is adopted as the outermost shell structure; a central area of the particle is provided with a particle poison core which has high-temperature gelling characteristics and is doped with a neutron poison; a particle middle cladding layer which is in a one-layer or multi-layer shell structure and has the high-temperature gelling characteristics is formed between the particle surface layer and the particle poison core. The neutron poison encapsulation particle can be carried and injected into a reactor core by a cooling agent through a special system under a severe accident condition that the reactor core of the nuclear reactor is melt down, so that the reactor core is deeply poisoned, and recriticality of the damage reactor core is completely avoided.