A conic bottom soft side line hole open-air conjunction box belongs to the power transmission and distribution engineering technology field. The bottom part of a conjunction box is cone-shaped, and plastic opening loops are arranged on line holes of the box bottom part. The bottom part of the conjunction box is not waterlogged and not damp, and a cable will not be worn by the line holes. The conjunction box can be used in an electric power equipment open-air conjunction box, such as an isolation switch auxiliary contact conjunction box.