Clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR-associated protein 9 (Cas9) (CRISPR/Cas9) gene editing technology was originated from the study of microbial CRISPR adaptive immune system, by using a specific guide RNA to identify target genes and guide endonuclease of Cas9. Some viral genomes are integrated into the cellular genome or lurk in the organization resulting in persistent infection. This review refers to the latest research results since 2013, focusing on the applications of CRISPR/Cas9 technology in tumorigenic virus infection, such as human immunodeficiency virus type 1 (HIV-1), human papillomavirus (HPV), hepatitis B virus (HBV), and Epstein-Barr virus (EBV)．