The invention discloses a method for preparing a preprocessed milky white mutton soup, which comprises the following steps: tenderizing by using a cooling acid method; mixing a material soup and clarifying fresh living beings; and homogenizing and emulsifying a broth, and other processes. The method is used for effectively solving the problems of clarification of a spice soup, maintenance of milky white bright mutton soup, tenderization and smell removal of mutton and the like, thus the mutton soup is convenient to eat and not restricted by seasons and regions.