The invention discloses a method for evaluating the authenticity of text information in a cyberspace, and the method comprises the steps: extracting a part of named entities in a text information library which is provided with real tags and of which the text information quantity meets the requirements, building an entity-relation database through combining with a designed entity-relation rule, andcalculating the score of each entity-relation; in combination with the entity-relationship score, constructing an entity-relationship network of the single piece of text information, thereby obtaining a representation vector of each piece of single piece of text information; and constructing an authenticity evaluation network of the text information by utilizing the representation vector of the single piece of text information, thereby performing authenticity evaluation on the single piece of text information of which the authenticity is to be determined.