Flexible board, connector and printed circuit board

The invention discloses a flexible board, a connector and a printed circuit board, the flexible board comprises a substrate, a first cover film and a second cover film, and the substrate comprises a differential line layer, a base layer and a reference layer which are sequentially stacked and arranged in a fitting manner; a plurality of differential line pairs which are arranged at intervals are formed on the differential line layer; the first covering film is attached to the side, away from the base layer, of the differential line layer, and the second covering film is attached to the side, away from the base layer, of the reference layer; the two opposite ends of the flexible board are respectively provided with a plurality of connection bonding pads. The two opposite ends of each differential wire pair are connected with the corresponding connection bonding pads respectively. By means of the structure, the flexible board is simple in structure and flexible to install. 本发明公开了软板、连接器以及印制电路板，其中，软板包括基板、第一覆盖膜以及第