The invention relates to a method for preserving and evenly thawing fast-frozen side dishes, belonging to the technical field of the further processing of agricultural products. The method comprises the following main steps of: selecting fresh vegetables as raw materials, washing, cutting, blanching, color conserving, cooling, draining, matching, packing, fast-freezing, storing and micro-wave thawing. According to the method, vegetables with different nutrients, textures and colors are matched together and are good for health after being eaten; and different vegetables are cut in different sizes to improve the thawing effect, and the combined thawing of samples is carried out by three-segment dielectric heating. The invention has the advantages that by the segmented combined thawing of dielectric heating, the colors of thawed fast-frozen side dishes are similar to that of fresh vegetables, the nutrients of the side dishes are well kept, the thawing is carried out evenly, the textures of the vegetables are well kept, the thawing quality of the fast-frozen side dishes is improved, thereby achieving the characteristics of effectively reduced thawing time, good original shape after the thawing, low production cost, energy saving and the like.