The invention discloses a processing technic for mixing raw materials for soy koji making. The processing technic comprises the following steps: directly mixing ripe soya just taken out of an evaporating pan and an auxiliary material to prepare the koji of soya koji making. The processing technic provided by the invention has the advantages of effectively reducing bacteria quantity of the koji, reducing the contest of bacteria and target microorganism for alimentation in the koji in koji making, and the prepared soy omagari has rich proteolytic enzyme; and proteolytic enzyme energy is high, and the protein utilization ratio in soy yeasting process is improved.