The invention discloses a purifying method for spherical graphite. The automatic purifying method for the spherical graphite comprises the following steps: adding the spherical graphite, fluoride, a complexing agent and water into a primary reaction tank, uniformly stirring, introducing steam, heating for 3h, and carrying out reaction for 8-12h at the temperature of 80-120 DEG C; after reaction, pumping a material into a primary filter press through a pipeline at the bottom by virtue of a material conveying pump, carrying out filtration and deacidification, collecting waste acid liquid into an acid storage tank for secondary reserve, introducing soft water, and cleaning the material to be neutral; sending the material discharged by the primary filter press into a middle pulping tank by virtue of a spiral material conveying device; adding aqua regia and water into the middle pulping tank according to a certain ratio, and stirring until the material is in a gruel shape, and pumping the material into a secondary reaction tank by virtue of the material conveying pump; introducing the steam, heating, and carrying out reaction for 4-8h at the temperature of 80-120 DEG C; after reaction, discharging the material, enabling the material to enter a secondary filter press by virtue of the material conveying pump, carrying out filtration and deacidification, collecting concentrated acid liquid into an acid storage tank, introducing deionized water, cleaning the material to be neutral, and drying the discharged material to obtain the high-purity spherical graphite, wherein the purity of the spherical graphite can achieve 99.99-99.995 percent.