The invention provides an electro-deposition metallic bellows forming device which is characterized in that a cathode rotational structure is formed by connecting a protective sleeve with a rotational connecting part in the axis of the protective sleeve and a motor shaft sleeve; the both ends of the inner wall of the cylindrical protective sleeve are lined with conducting plates, the two same conducting plates are fixed on the both ends of a support through conducting bolts and the rotational connecting part; a plurality of mandrel spacing holes are uniformly distributed on each conducting plate radially; the center of each conducting plate is provided with a square bracket positioning hole, the both ends of a bellows mandrel are placed in the corresponding mandrel spacing holes; and the conducting bolts are connected with a cathode power supply, one end of the rotational connecting part is square and inserted in one bracket positioning hole, and the other end of the rotational connecting part is connected with a rotating motor in a gear drive manner. By using the device provided by the invention, the efficiency can be increased, and energy conservation and time conservation can be realized; and the quality of the produced bellows product is better than that of the product produced by the existing barrel plating and rack plating technologies.