Waterproof plug

The utility model discloses a waterproof plug which is composed of a male plug, a female plug, a connecting male plug, a female plug and a nut, the outer side face of an external thread positioning ring on the male plug is sleeved with a first waterproof ring, the outer side face of a butt joint ring on the female plug is sleeved with a second waterproof ring, and when the male plug and the female plug are connected through the nut, the two waterproof rings are adopted for waterproof sealing. The waterproof sealing performance is better, the butt joint ring and the external thread positioning ring are in butt joint, the butt joint ring is inserted into the inner side of the external thread positioning ring, the female plug socket and the male plug socket are in butt joint, plugging and positioning of the plug and the female plug are facilitated, the male plug socket is provided with a T-shaped notch, and the female plug socket is provided with a T-shaped protrusion matched with the T-shaped notch in a pluggin