A waterproof optical fiber connector includes a flange and a terminal connector. The terminal connector includes an outer casing, an inner casing, an optical fiber and a connecting component coupled with the fiber. The inner casing is tubular for housing the fiber and the connecting component. The outer casing is tubular for housing the inner casing. The inner casing includes a body and a waterproof clip connected to a back end of the body. The fiber passes through the clip. The tail of the inner wall of the outer casing tapers from the front to the back, pressing the clip inwards such that the clip and the fiber are fixed together. At least one first protrusion is provided on the inner surface of the front end of the sleeve of the flange, and the front end of the body of the inner casing bears against the first protrusion.