The invention provides a dyskinesia cortex plasticity management method based on transcranial electrical stimulation brain-muscle coupling. The method comprises the following steps: firstly, a functional brain area multi-lead EEG signal is analyzed; a brain function network modeling method is adopted to calculate brain function network indexes of connectivity and small-world characteristics, the brain function network characteristics before and after tDCS stimulation are compared, and functional connection and nerve remodeling rules of a functional anterior region, a functional region and a functional perception region of a stimulated hemisphere in the exercise activity period are revealed; then, brain-brain, brain-muscle and muscle-muscle coupling characteristic indexes are extracted by adopting a multi-level neuromuscular coupling analysis method based on causal measurement of a dynamic regression model, and the rehabilitation effect of upper limb movement functions is described fromdifferent side surfaces; and finally, the correlation between the brain-muscle electric coupling characteristics and the influence rule of the tDCS on the nerve plasticity is studied, a basis is provided for further improvement of the stimulation mode and parameters of the tDCS, and effective guidance and management of motor function cortex nerve remodeling are achieved.