Pelvic inflammatory disease is the most common infectious disease of the upper female genital tract. If not treated promptly and thoroughly, chronic pelvic inflammatory disease (medically known as pelvic inflammatory disease sequelae) can affect pregnancy, manifesting as infertility and tubal pregnancy, seriously affecting women’s reproductive health and increasing the economic burden on families and society. The main pathological changes of chronic pelvic inflammatory disease are tissue destruction, extensive adhesions, hyperplasia and scar formation. This leads to tubal obstruction, tubal thickening; if the umbilical end of the fallopian tube is atretic, plasmacytic exudate collects to form hydrosalpinx and tubal pus; manifesting as infertility (20-30% incidence of infertility after pelvic inflammatory disease) and ectopic pregnancy (the incidence of ectopic pregnancy after pelvic inflammatory disease is 8-10 times higher than normal women, commonly tubal pregnancy). Clinically, patients with infertility caused by pelvic inflammatory diseases can be treated with minimally invasive laparoscopic surgery and antibiotics to reduce the incidence of infertility or ectopic pregnancy; tubal recanalization for tubal obstruction; tubal windowing + umbilical end reconstruction for tubal atresia and hydrocele; assisted reproduction techniques such as IVF-ET (in vitro fertilization) to help conception if necessary. If necessary, assisted reproduction techniques such as IVF-ET (in vitro fertilization) can be used to assist conception. Pelvic inflammatory disease can affect pregnancy, especially if the treatment is not timely and complete, and the sequelae are often infertility and ectopic pregnancy, we should pay attention to the prevention and treatment of pelvic inflammatory disease to reduce the occurrence of pelvic inflammatory disease and sequelae.