The invention discloses an 
in vitro culture method of 
cervical intraepithelial neoplasia cells. The 
in vitro culture method comprises the following steps: step one, taking a small piece of human cervical neoplasia tissue; step two, after digesting and decomposing by a type I 
collagenase, preparing a 
cell suspension; step three, utilizing a 
trypan blue dye exclusion method to judge the 
cell activity; step four, introducing the 
cell suspension into a culture 
bottle containing a low 
fetal bovine serum culture medium and coated with 
rat tail collagen, and waiting for the cells to adhere to the wall; and step five, after the cells adhere to the wall, replacing with a serum-free culture medium, purifying the 
cervical intraepithelial neoplasia cells, replacing the culture liquid weekly for at least two times, and after the cells are fused to 80%-85%, carrying out passage. The CIN cells cultured by the method have 
high survival rate and high purity, allows the morphology of the cells after passage to have no obvious change compared with that of the primary cells, and is carried with 
human papillomavirus (HPV); and the success of the CIN cell 
in vitro culture provides 
technical support for research on treatment of 
cervical cancer.