The invention discloses a method for preparing seasoning instant PetasitespalmataA.Gray. The method comprises the following steps of: S1, selecting, inspecting and washing fresh PetasitespalmataA.Gray, blanching, cooling, peeling and adding salt for salting; S2, after salting, elutriating by using saline, draining water, adding white granulated sugar, inoculating a complex microbial inoculant, and fermenting; and S3, removing partial salinity, seasoning, packaging, vacuum bagging, and sterilizing, thus obtaining a finished product. The method has the beneficial effects that alcoholic fermentation is carried out by using acid-resisting yeast and taking sugar as a culture medium, obvious and faint soy sauce flavor is generated by virtue of common effects of saccharomycetes and lactic acid bacteria, thus the unique taste and flavor of the instant PetasitespalmataA.Gray are obtained, and meanwhile the nutritive value of the instant PetasitespalmataA.Gray is also improved; the complex microbial inoculant can reduce the pH of the environment and inhibit growth of harmful microbes, and also has the capacity of degrading nitrite so as to guarantee the edible safety of the product; and the method is convenient and easy to operate, mature in technology, easy to learn and convenient to popularize, and industrial production can be realized.