The invention discloses a solar cell broken grid repairing device which comprises a rack as well as a controller, a cell loading device, a cell receiving device, a cell vacuum drawing device, a cell positioning device, a silver grid line optical scanner for capturing the broken grid part of a cell and a silver slurry spraying device which are respectively installed on the rack, wherein a guide-rail-type transmission device is adopted for the moving of the solar cell in a working surface; the solar cell is positioned in a working region by adopting a vacuum absorption mode; then an optical scanning system is adopted for scanning the silver grid line of the solar cell surface in the working region so as to capture the coordinate position of the solar cell grid broken part; and a printing system sprays a silver slurry to the grid broken part through the coordinate position of the grid broken part. Thus the broken grid in the existing printing process is repaired by adopting the simple and feasible method adopted by the invention, the electricity current loss in the production process of the solar cell is remedied, and simultaneously the production defect-free rate of the cell is improved.