The invention provides a preparation method of mixed egg liquid. The preparation method comprises the following steps: (1) poultry eggs are disinfected, aired and broken to obtain egg liquid; (2) additives of
sodium caseinate,
sodium carboxymethylcellulose, hydroxypropyl
starch and
maltodextrin are added; (3) high-density
carbon dioxide treatment is conducted on the egg liquid, and the treatment temperature is 38-42 DEG C; a high-density CO2 environment is formed in a treatment kettle; the treatment lasts for 20 minutes under 20 MPa; (4) the pressure is relieved after the treatment is finished; the egg liquid is taken out, and put in
ice water for cooling, and then stored under the condition of 2-4 DEG C. The preparation method adopts the high-density CO2 cold disinfection mode to treat the mixed
protein liquid, and regulates the disinfection treatment conditions according to the egg liquid properties; the used
carbon dioxide has of properties of chemical inertness, no
corrosion, high volatility and unique economy, so that energy is saved; as the disinfection and
enzyme deactivating are conducted under the condition of low temperature, the qualities of
nutrition,
flavor and freshness and the like of the mixed
protein liquid are kept to the maximum extent; compared with
pasteurization, the disinfection method has the advantages that the
shelf life of the mixed egg liquid is longer.