One-step synthesis method for hollow carbon case

The invention relates to a method for synthesizing a micro-nanometer level hollow polymer ball, a carbon ball and a graphitized ball by one step. The method comprises the following steps that: hydroxybenzene and aldehyde are used as raw materials; lysine is used as a catalyst; fatty alcohol is used as a solvent; a polymer hollow ball with an even dimension can be produced by polymerization at a temperature of 80 DEG C; and the polymer hollow ball is further charred to produce a hollow carbon ball. If Fe is introduced into the polymer hollow ball, the polymer hollow ball is charred to produce a graphitized hollow ball. Through changing a molar ratio of the hydroxybenzene and aldehyde, the catalyst amount and the type of the solvent, the hollow carbon ball with a grain diameter of between 0.6 and 2 mu m can be produced. The micro-nanometer level hollow carbon ball has an even and controllable grain diameter, high purity, smooth surface, stable performance and high technical added value, is suitable for a lo