The invention discloses a preparation method of frozen prepared chicken cutlet. The preparation method comprises the following steps: selecting materials, cutting into blocks, preparing a tumbling liquid, tumbling, curing for being tasty, adding cheese, preparing wrapping powder and wrapping pulp, coating the wrapping powder and the wrapping pulp, frying in advance, placing in a dish and quick-freezing, packing, performing metal detection and storing, wherein in the preparation process, the tumbling liquid is prepared from the following components: salt, white granulated sugar, monosodium glutamate, composite phosphate, white pepper powder, garlic powder, and water at the temperature of 0-5 DEG C; and the wrapping powder is prepared from 48-52 parts of wheat flour, 28-32 parts of cassava modified starch, 18-22 parts of sweet potato flour, 0.3-0.7 part of xanthan gum, 0.3-0.7 part of pyrophosphate. The preparation method is applied to processing of frozen prepared food, a product is attractive in appearance, rich in nutrition, delicious, and long in guarantee period, and has a good market development prospect.