Straw crushing and returning machine, used in conjunction with tractor, fully suspended operation. Its characteristics are: low power consumption, good crushing effect, uniform distribution of fragments, long blade life, strong adaptability, low overall failure rate, and easy use and maintenance. Mechanized crushing of straw directly returns to the field, saving labor and effort, promoting agricultural production and income increase, avoiding environmental pollution caused by burning straw, and transforming medium and low yield fields. It effectively protects the ecological environment and reduces the incidence of crop diseases and pests, making it an ideal tool for mechanized crushing of straw directly returns to the field.