Wire input and output plugging system and prefabricated cabin using system

The invention relates to a wire input and output plugging system and a prefabricated cabin employing the system. The plugging system comprises cover plates. The cover plates comprise transverse cover plates and a vertical cover plate. Two transverse ends of each transverse cover plate are used for connecting with two transverse sides of a wire inlet and outlet. Two vertical ends of the vertical cover plate are used for connecting with the two transverse cover plates arranged at intervals in the vertical direction or are used for connecting with the vertical side of the transverse cover plate and the vertical side of the wire inlet and outlet. A connection structure detachably fixed with the corresponding end of the vertical cover plate is arranged on each transverse cover plate. During usage, the left wire passing channel can be plugged by a vertical cover plate with an appropriate size further after the transverse cover plate is arranged, therefore the opening size after plugging is decreased furthest, plugging is complete, moisture entering can be reduced effectively, and the work quality is high. In addition, the vertical cover plate is arranged vertically, region division of different cables can be achieved, and maintenance and overhauling are convenient.