Mechanized straw mixing and returning technology refers to the use of straw shredding machinery to crush the harvested corn, wheat, rice and other crop straw on site, evenly scatter it on the surface, and then use rotary tillage equipment to plow it into the soil, fully mix the straw with the surface soil, and decompose and rot in the soil, achieving a simple and easy to operate applicable technology that improves soil structure, increases organic matter content, and promotes sustained crop yield increase.