The invention discloses a moving cutter structure applied to a straw crushing and field returning machine. The moving cutter structure is formed by cutting a steel plate and comprises a cutter body and a tool bit, wherein a bending angle exists between the cutter body and the tool bit; symmetrical cutting edge structures are formed on the inner side of the tool bit. The moving cutter structure hasthe advantages that the moving cutter structure is formed by directly cutting the steel plate, secondary machining is not needed, the moving cutter structure is good in integrity and high in mechanical strength, and the cutter body is less prone to bending and deformation; deflection and bending, caused by influence of air flow on the cutting edge structures during the high-speed rotation of a cutter head, of the symmetrical cutting edge structures can be avoided, and safety is increased.