A watertight connector has a shell, an insulating housing wrapped in the shell, a plurality of terminals mounted into the shell, a fixing element fixed on the shell. A rear of the insulating housing is recess to form a receiving cavity for receiving a fixing block molded with a plurality of terminals, so there is no hole between the terminals and the insulating housing. A fixing element is fixed on the shell to seal openings of the shell for providing excellent waterproof property. So, all the openings of the watertight connector are sealed tightly. Also, the structure of the watertight connector is simple for reducing the production cost.