The invention relates to a preparation method of instant mixed rice with egg. The preparation method comprises the following steps: cleaning carrots and then dicing to obtain diced vegetable; dicing chicken sausage to obtain diced sausage; cleaning green Chinese onion and then cutting into shreds to obtain shredded green Chinese onion, stir-frying the shredded green Chinese onion with hot oil until becoming fragrant, then adding egg liquid, table salt, white granulated sugar, spices and soy sauce, and cooking to obtain diced egg; cleaning a preset amount of rice, and soaking to enable rice grains to be completely changed into powder from cutin; adding a certain amount of purified water, and precooking under negative pressure so as to enable the rice grains to be basically cooked and keep the shapes of the rice grains complete; mixing the dispersed rice with the diced egg, diced sausage and diced vegetable in proportion, and evenly stirring to obtain a semi-finished product of the instant mixed rice with egg; steaming the semi-finished product of the instant mixed rice with egg under the negative pressure; quantitatively packaging the semi-finished product of the instant mixed rice with egg steamed under the negative pressure by using high-temperature retort bags, exhausting, sealing, and sterilizing to obtain the finished product of the instant mixed rice with egg. The invention also provides the instant mixed rice with egg.