The invention discloses miconazole nitrate compound vaginal extended-release effervescent tablets and a preparation method thereof. The effervescent tablets comprise miconazole nitrate, Corydalis tuber, Tricyrtis root, lightyellow Sophora root, cutch, Wilson's passion flower, root of Silene tenuis, root-bark of shaggy-fruited dittany, fleeceflower root, Chinese mugwort leaf, sodium alginate, polyoxyethylene, fumaric acid, sodium carbonate, sodium bicarbonate, lauryl sodium sulfate, powdered sugar, and polysorbate. The preparation method includes: preparing materials, extracting effective ingredients of herbal materials, and performing granulating and tableting. The miconazole nitrate compound vaginal extended-release effervescent tablets are a Chinese and western medicine mixture, the defect that miconazole nitrate is only capable of killing germs and diminishing inflammation is effectively overcome, and the herbs are good in synergistic effect. Hydrophilic gel extended-release material is used as a medicinal auxiliary material, acting time of the tablets and administering interval can be prolonged, and bioavailability of the tablets can be improved; the tablets directly act on an affected part, take effect fast, are good in effect, are convenient to use and allow higher patient compliance.