The solution with ZnSO₄ was chosen to repair the crack of concrete by electro-migration. To explore the influence of current density on electrodeposition repairing performance, mineral composition and microstructure of the sediments, the electrical resistance and crack filling depth were used in this study. Results show that the resistance of concrete specimens increased significantly after the electrodeposition repair for 36 days, and the growth rate of resistance decreased with increase of energization days. The early rate of the resistance increase was faster, and the depth of crack filling was more shallow with increase of current density. Besides, X-ray diffraction results showed that ZnO was the main mineral component of the sediments. Scanning electron microscopy results showed that the size of sediment particles increased with increase of current density. The rank of sediments was more ordered and the microstructure was more compacted as the current density decreased.