The present study aimed to investigate the mechanism of penile damages in experimental autoimmune prostatitis (EAP) rat models to reveal the potential pathological mechanism of the relationship between CP and penile damages. Sprague-Dawley (SD) rats were administered with different concentrations of prostate tissue homogenate supernatant (PTHS) by multipoint subcutaneous injection to establish EAP models. IHC staining was done to assess the expression of inflammatory cytokines in prostate tissues and the corpus cavernosum of penis. Masson and Tunel staining was conducted to observe the fibrosis and apoptosis in the corpus cavernosum. Finally, the functional changes of corpus cavernosum were assessed by WB and IHC staining. The results revealed that EAP rats with different prostatitis severity were successfully established by PTHS. The expression of IL-1β, IL-6 and TNF-α in prostate tissues increased with the concentration of PTHS. The results of Masson and Tunel staining indicated fibrosis and apoptosis gradually aggravated in corpus cavernosum among different subgroups. The function of cavernosum impaired by prostatitis from WB and IHC results and positively with the severity. In conclusion, there existed the infiltration of inflammatory factors and impaired function in the corpus cavernosum of EAP rats' penis and positively correlated with the severity of prostatitis.