The invention belongs to the field of photocatalyst application of organic semiconductors and in particular relates to application of a heteroatom-containing triazine covalent organic framework material in photocatalysis. The heteroatom-containing triazine covalent organic framework material serves as a photocatalyst. The preparation method comprises the following steps: introducing heteroatoms through heterocyclic aldehyde group monomers, carrying out a condensation polymerization reaction with binary or poly-element amidino compounds in the presence of a basic catalyst, thereby obtaining theproduct. The material serves as the photocatalyst, and is capable of degrading organic pollutants in water and producing hydrogen under light conditions by virtue of water splitting. According to themethods, the heteroatom-containing triazine covalent organic framework material is introduced to serve as the photocatalyst, and is high in catalytic efficiency, high in applicability and suitable for large-scale application.