The invention discloses a preparation method of instant diced chicken in the deep processing of chicken products. The instant diced chicken comprises the following raw materials: 50-60g of diced chicken, 30-40g of concentrated chicken soup, 1-3g of dried egg white, 1.3-1.8g of salt, 1-2g of white sugar and 0.3-0.5g of monosodium glutamate. The preparation method comprises the following steps: firstly dicing the chicken to be convenient for eating; secondly, injecting 10-20 percent of compound seasoning salt water by an injector; preserving for 4-6h to be tasty, placing into a cooking furnace to cook for 30-40min at a temperature of 80-90 DEG C; thirdly, quickly freezing at a quick-freezing temperature below -38 DEG C for 3-5h, then packaging, and placing into a refrigerator with a temperature below -18 DEG C for storage. The product produced by adopting a scientific process and a scientific formula is convenient for eating; when being eaten, the diced chicken and the chicken soup are heated and stewed by adding a small quantity of water until to be boiled so that people can eat the chicken without adding other materials; the instant diced chicken has bright appearance, is soft so as to be easy to chew, is fresh in soup, rich in nutrition and special in taste.