Waterproof plug

The utility model provides a waterproof plug which comprises a pipe-shaped main body and a positioning hoop sleeved on the pipe-shaped main body, a reinforcing area is added at an inlet of a corrugated area of the pipe-shaped main body, and the positioning hoop is sleeved on the reinforcing area. According to the waterproof plug, the risk that the waterproof performance of the tubular body of the reinforcing area is damaged due to the fact that the power line is bent can be reduced, the waterproof effect of an inlet of the corrugated area is improved, the waterproof effect of assembly of the waterproof plug and the power line is further improved, the waterproof guarantee of electric equipment in a vehicle is improved, and the reliability of the vehicle is improved. 本实用新型提供一种防水堵头，其包括管型主体和套设在管型主体上的定位箍，在管型主体的波纹区入口处增加了加强区，定位箍套设置在加强区。本实用新型的防水堵头可降低加强区的管型主体受电源线弯折影响而破坏防水性能的风险，提高了波纹区入口处的防水性效果，进而提高了防水堵头与电源线的装配防水效果，提高了车内用电设备的防水保障，提高了车辆可靠性。