The invention discloses a novel special lubricating oil additive for a coal mine pressure fan and a preparation method thereof. The novel special lubricating oil additive for the coal mine pressure fan provided by the invention is composed of 27% of diheptyl diphenylamine, 20% of octadecyl carbamate, 17% of boronized polyisobutene bis-succinimide, 12% of modified petroleum calcium sulfonate, 19% of di-tert-alkyl zinc dithiophosphate and 5% of diluted oil, wherein diheptyl diphenylamine, octadecyl carbamate, boronized polyisobutene bis-succinimide, modified petroleum calcium sulfonate, di-tert-alkyl zinc dithiophosphate and diluted oil need to reach the standards of industrial-grade qualified products or above. The special lubricating oil additive provided by the invention is used in lubricating oil of a mine pressure fan system, and effectively guarantees that a device can reliably operates for a long term under the states of high oil temperature, high load and no interruption.