Disclosed is a multilayered electrode plate of a supercapacitor. The multilayered electrode plate comprises a current collector, a conductive layer, an active material layer and a plasticizing layer; the preparation method comprises the following successive steps of preparing the paste or pasty material of the conductive layer, the active material layer and the plasticizing layer; coating the surface of the current collector with the conductive layer paste, and then performing drying and rolling-in to form the conductive layer; coating the surface of the conductive layer with the active material layer paste, and then performing drying and rolling-in to form the active material layer; and arranging the plasticizing layer pasty material on the surface of the active material layer through a spraying manner or a gravure printing manner, and then performing rolling-in to form the plasticizing layer. The adhesive conductive layer is arranged between the current collector and the active material layer, so that the adhesion degree of the active material layer can be improved while the high conductivity can be ensured; in addition, the active material layer is covered with the plasticizing layer, so that the flexibility of the pole piece can be further improved; the falling off of the active material layer from the current collector can be prevented; the service life of the supercapacitor under a high temperature load condition can be prolonged; and the electrode plate with higher specific energy, specific power and conductivity can be obtained.