Connecting device capable of being positively and negatively connected

The utility model discloses a connecting device capable of being positively and negatively connected, which comprises a plurality of sheet-shaped connecting wires, an upper shell and a lower shell, one end of each sheet-shaped connecting wire is connected with a conductive contact assembly, and the other end of each sheet-shaped connecting wire is electrically connected with the conductive contact assembly, a connector joint, a power plug or a load. The conductive contact assembly comprises a first conductive contact piece and a second conductive contact piece which are embedded in the upper surface and the lower surface of the sheet-shaped connecting line. The upper end face of the lower shell is provided with at least two plug-in mounting convex edge parts in an extending mode, and a stacking groove used for stacking the conductive contact assemblies is defined between the plug-in mounting convex edge parts. According to the utility model, the structural design is reasonable, the conductive contact assembli