The invention provides an electrode material for a super lead acid battery, a preparation method of the electrode material and a method for preparing a cathode of the super lead acid battery by using the electrode material, and relates to an electrode material, a preparation method thereof and preparation of a cathode of a battery. The problem that the working electric potential of a porous carbon electrode of the conventional super-capacitor is greatly different from that of a cathode of a lead acid battery is solved. The electrode material for the super lead acid battery consists of a porous carbon material and a modified material. The preparation method comprises the following steps of: preparing the modified material into a solution; mixing the solution and the porous carbon material; adding dilute sulphuric acid in the mixture; and filtering and drying the mixture to obtain the electrode material, or mechanically mixing the modified material and the porous carbon material to obtain the electrode material. The method for preparing the cathode of the super lead acid battery comprises the following steps of: manufacturing the electrode material into an electrode plate; parallelly connecting the electrode plate and a cathode of a lead acid battery; or mixing the electrode material and the material of the lead acid battery, and preparing the mixture into an electrode so as to obtain the cathode of the super lead acid battery. The initial working electric potential and the hydrogen precipitation electric potential of an electrode for the super lead acid battery are similar to those of the lead acid battery; and the electrode can be used for super lead acid batteries or super-capacitors.