The invention belongs to the field of gas-insulated metal-enclosed combined electric appliances, and particularly relates to a cylinder component used for a gas-insulated metal-enclosed switchgear and a cylinder connecting flange. The cylinder connecting flange comprises a base body; at least a breaking joint for cutting off an annular body is arranged on the base body; the breaking joint is provided with a filling part with the magnetic permeability lower than that of the base body; the filling part is fixedly connected with the base body; the arrangement of the filling part cuts off or reduces an eddy path on the base body, avoids or weakens excessive heating of the cylinder connecting flange; and as the filling part is fixedly connected with the base body, the connecting flange can be guaranteed to have relatively good intensity and relatively good air impermeability.