The invention discloses a sulfur-doping porous carbon material of a sodium ion battery and a preparation method of the sulfur-doping porous carbon material. The sulfur-doping porous carbon material is formed by chemical doping of sulfur in a carbon material, and the carbon material has a loosen and porous spongy structure. The preparation method comprises the following step of preparing a metal organic frame material from a metal inorganic salt and an organic ligand by an in-situ growth method; and grinding and mixing the metal organic frame material and sulfur powder, placing the obtained mixture in an inert gas, carrying out low-temperature thermal treatment and then carrying out high-temperature carbonization on the obtained mixture, and washing and drying the carbonized product to obtain the sulfur-doping porous carbon material. The sulfur-doping porous carbon material prepared according to the method has excellent long-circulation stability, favorable rate performance and high specific capacity when taken as a negative electrode of the sodium ion battery; and moreover, the preparation method is simple, is low in cost and has wide industrial application prospect.