Preparation method of plant fiber doped and polymerized modified activated carbon carbon electrode

The invention relates to the field of electrochemical materials for preparing carbon electrodes, and concretely relates to a preparation method for doping modification of an activated carbon electrode. Nanoscale plant fibers are added in the electrode manufacturing stage, then a tabletting electrode is prepared, and organic matter monomers are added under the mild condition after the electrode is formed, so that the fibers in the electrode react with the monomers under the action of a cross-linking agent and are converted into a water-absorbing polymer. The water-absorbing polymer in the electrode expands after absorbing water, collapsed pore spaces in the original activated carbon are expanded again, the specific surface area of the activated carbon is fully utilized, and monomers such as acrylic acid added in the modification process can enrich oxygen-containing groups on the surface of the electrode; most importantly, nanoscale water absorption substances in the electrode can effectively improve the intern