The invention belongs to the technical field of egg product processing, and more particularly relates to a preparation method of a novel shell-free preserved egg with the traditional preserved egg flavor and a product thereof. The invention discloses a preparation method of the shell-free preserved egg and a flavoring agent. The formula of the flavoring agent comprises food grade sodium carbonate, sodium chloride, ferrous sulfate, tea dust, etc. The preparation method of the invention is characterized by simple method, quick preparation speed and short preparation time. The finished product has the nutrients and the flavor of the traditional preserved egg, and is convenient and sanitary in eating, which is suitable for large-scale production.