A fixing enhancement mechanism for large iron core, including an iron core and two end rings. The iron core is composed of several arc-shaped bodies, which are successively connected in an annular form with their curvature centers coinciding with each other. The end rings are coaxially fixedly connected to two axial ends of the iron core respectively to keep the iron core in the annular form. The fixing reinforcement mechanism further includes an enhancement section having several rod-shaped enhancement members. The enhancement members are bridged between the two end rings in abutment with outer arc surfaces of the arc-shaped bodies. According to the fixing enhancement mechanism, the components for fixing the large iron core are simplified and the fixing performance is enhanced to keep the motor operating stably.