The present invention discloses a fermented horse meat food and its preparation method. The formula for preparing fermented horse meat includes the following components: (by using 100kg of horse meat weight as reference) 4%-6% of edible salt, 5%-20% of sugar, 0.3%-0.4% of phosphate, 0.003%-0.005% of nitrite, 0.5%-0.7% of sodium ascorbate, 0.4%-0.6% of white pepper, 0.1%-0.15% of sage, 0.1%-0.15% of nutmeg, 0.05%-0.1% of cassia bark, 0.2%-0.3% of coriandrum sativum, 0.2%-0.8% of garlic, 0.1%-0.2% of basil and 3% of composite inoculum. Its preparation method includes the following steps: selecting materials, defrosting, finishing, cleaning, pickling, making fermentation, roasting and vacuum packaging so as to obtain the invention horse meat food.