The present invention relates to a migration-resistant red dye, a preparation method therefor and application thereof. The preparation method for the dye comprises the following steps: (a) mixing 2-amino-5-nitrophenol, 2-aminophenol-4-sulfamide, sodium nitrite, hydrochloric acid and water to react, and obtaining a diazonium product; (b) adding a mixed solution of 3-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl) benzenesulfonamide, caustic soda liquid and water to a vessel to react with the resulting diazonium product in the step (a), and obtaining a coupling product; (c) performing chromium complexation on basic chromium sulfate and the resulting coupling product in the step (b); (d) reacting a product obtained from the chromium complexation with a mixed solution of formic acid, n-tridecyl amine and water; and (e) after completion of the reaction, filtering and drying. The dye is resistant to a high temperature, is relatively inexpensive, and has good migration resistance.