Abstract: Campylobacter jejuni is the main cause of human bacterial diarrhea worldwide, particularly in developing countries. With the development of molecular biology and strains identification technique, the detection rate of campylobacter jejuni in gastroenteritis in developing countries has improved significantly. In addition, other diseases related to campylobacter jejuni infection have been increasingly reported. In this review, we discuss campylobacter jejuni and its relevant diseases including intestinal and extra-intestinal diseases, and also describe the development of the campylobacter jejuni detection methods in recent years.