The invention discloses a gel-state electrode and a preparation method thereof. The electrode comprises an electrode active material, a conductive agent, SN, a lithium salt, a polymer and an additive. The preparation method comprises the following steps of dissolving the lithium salt and the additive in SN at 60-80 DEG C, adding the polymer, and fully stirring and dissolving to form a gel-state substance, and then, mixing the prepared gel-state substance, an electrode active material and a conductive agent, stirring or uniformly grinding, and coating one side of a solid electrolyte with the mixture to serve as the gel-state electrode of the solid-state battery. According to the type of the added polymer, whether cross-linking treatment is carried out or not is determined. The lithium salt can be completely dissolved in SN to form a plastic crystal electrolyte, and the selected polymer can also be dissolved in the plastic crystal electrolyte. According to the gel-state electrode provided by the invention, the contact performance between the electrode and the solid electrolyte can be improved, the ion transmission in the electrode can be improved, and the negative effect on the battery performance caused by the volume change generated in the charging and discharging process of the electrode active material can also be inhibited.