PROBLEM TO BE SOLVED: To provide a method for preventing the turbidity of an egg soup, and a sterilization working liquid whole egg for an egg soup capable of preventing the turbidity of an egg soup.SOLUTION: Provided is a method for preventing the turbidity of an egg soup using a sterilization working liquid whole egg with a pH of 6.0 to 7.0 by blending organic acid and/or inorganic acid in a sterilization working liquid whole egg having a viscosity of 10 to 2,000 mPa s and having heating/solidification force. Also provided is a sterilization working liquid whole egg for an egg soup whose pH is adjusted to 6.0 to 7.0 by blending organic acid and/or inorganic acid in a sterilization working liquid whole egg for an egg soup having a viscosity of 10 to 2,000 mPa s and heating/solidification force.