The invention relates to a sodium ion solid-state battery, which is composed of a battery shell, a current collector, a positive electrode material, a negative electrode material and a solid electrolyte. The negative electrode material is a metal sodium electrode, the positive electrode material is a metal sulfide material, and the solid electrolyte is a sodium salt metal oxide. Composite material, including the following components: 60-100 parts of phenolic resin, 80-100 parts of silica / silicon nanoparticles, 0.1-0.5 parts of N, B-doped graphite microparticles, 650-730 parts of sodium zirconate, niobium 1-3 parts of sodium, 2-5 parts of polyethylene terephthalate, 3-7 parts of azobenzene, silica / silicon particles provide a stable channel for ion transmission, which can improve its rate performance, The addition of azobenzene can enhance the interconnection between lattices and increase the diffusion and migration channels of sodium ions. The graphite microparticles are doped with N and B, and the doping of N and B elements makes the thermal dryness, lubricity and electrical conductivity of graphite. It is improved, thereby improving the cycle performance of the sodium-ion solid-state battery, which is beneficial to industrial production.