The invention discloses a series line device of a chassis, include a support plate I, sliding block, Support plate II, groove I, guide rail I, guide rail II and groove II, the surface of the support plate is provided with a groove, The surface of the support plate II is provided with a groove II, A card plate is arranged between the support plate I and the support plate II through a groove I and agroove II, the two ends of the card plate are fixedly installed with guide rails I and II, A plurality of sliding blocks are installed on the card plate through the guide rails I and II, The two endsof the slide block are provided with grooves, the width of the groove is the same as that of the guide rail I and the guide rail II, so that a large amount of time is not required to search for the wire head of the series line, the damage of the line segments does not occur, the production cost can be saved, the disassembly process of the whole panel is not affected, the working efficiency is improved, and the working time is saved.