The invention belongs to the technical field of processing of preserved eggs, and discloses a preparation method for preserved eggs. The method comprises the following steps that main materials and auxiliary materials are prepared, and the main materials comprise, by weight, 16-18 parts of quick lime, 5-7 parts of plant ash, 1.5-3.5 parts of a sodium hydroxide solutionand 35-45 parts of yellow mud; the auxiliary materials comprise, by weight, 0.15-0.45 part of rhizomaatractylodismacrocephalae, 0.2-0.4 part of semen euryales, 0.15-0.45 part of schizonepeta, 0.15-0.45 part of carthamustinctorious, 0.2-0.4 part of fresh ginger, 0.2-0.4 part of rosin, 0.25-0.55 part offolium artemisiaeargyi and 0.2-0.4 part of asarum; thequick lime, the plant ash and the sodium hydroxide solution are mixed into ash materials; after the rhizomaatractylodismacrocephalae, the semen euryales, the schizonepeta, thecarthamustinctorious, the fresh ginger, the rosin, the folium artemisiaeargyi and theasarum are stewed into medicine soup, a medicine bag is taken out, the yellow mud is placed in themedicine soup for stirring, and the mixture is prepared into medicine mud in a paste shape; fresh duck eggs are placed in the medicine mud and rolled; the duck eggs are placed in the ash material and rolled; after the fresh duck eggs attached with the ash material in the step five are fermented in a sealing mode for 22-30 days at thetemperature of 20-25 DEG C, the duck eggs are taken out for airing for 1-3 days, and the preserved eggs are obtained. The preparation method can reduce the content of metal of thepreserved eggs.