Fuente: Wipo "BigData" The embodiment of the invention relates to the technical field of big data, and provides a fraud analysis method for online service dialogue big data, a server and a medium, and the method comprises the steps: carrying out the fraud intention discrimination of heterogeneous service dialogue texts through different fraud intention discrimination components, carrying out the dialogue text checking of the heterogeneous service dialogue texts through the fraud intention discrimination components, and carrying out the fraud analysis of the online service dialogue big data. Content matching and discrimination consistency of different types of service dialogue texts are ensured, so that the anti-interference effect for different types of service dialogue texts can be improved during fraud intention discrimination, and the precision and credibility of fraud risk decision viewpoints are improved. In conclusion, the technical scheme provided by the embodiment of the invention can improve the technical problem that the traditional technology is difficult to accurately and reliably carry out fraud risk decision analysis on the service dialogue text.