The present disclosure may obtain an electrode for an all-solid-state battery with low porosity by adjusting the concentration of an electrode active material layer-forming slurry and a solid electrolyte layer-forming slurry. The all-solid-state battery uses a solid electrolyte material, not a liquid electrolyte material, and thus it needs to have a close contact between the constituent materials of the battery such as an electrode active material and a solid electrolyte material, and when the manufacturing method according to the present disclosure is applied, the electrode active material layer is filled with the solid electrolyte material, bringing the components into close contact, thereby improving the interfacial resistance characteristics.