The invention relates to a highly compact ceramic ball of silicon carbide and a preparation process thereof. The ceramic ball is prepared through carrying out steps of batch mixing, spray granulation, seed production, balling, and sintering on the following raw materials: 85-95% of a main material fine silicon carbide powder, 4-10% of a high char yield phenolic resin, 1-5% of a sintering aid, 1-10% of the weight percentage of the main material of a binder, and 0.5-3% of the weight percentage of the main material of a dispersant, wherein the binder is at least one of polyvinyl alcohol, dextrin, and carboxymethyl cellulose, and the dispersant is at least one of polyethylene glycolm, tetramethylammonium hydroxide, an aluminophosphate, and polyacrylic acid. According to the invention, active beneficial effects comprise that: 1, the ceramic ball of silicon carbide has the advantages of high density and stable chemical property; 2, the preparation process of the invention allows preparationof ceramic balls of silicon carbide with particle sizes of various specifications to be satisfied, so the ceramic balls with the particle size having a wide range of 1-50mm to be produced; and 3, theprocess is simple, one-time investment is less, and production expansion is easy.