A display panel and a method for repairing signal lines thereof are disclosed. The display panel includes at least one shorting bar, switches, and auxiliary repair lines. The switches are electrically coupled respectively to signal lines and the at least one shorting bar. Both ends of each of the auxiliary repair lines overlap one of connections between the switches and the at least one shorting bar. When a signal line is damaged, the method for repairing includes: breaking off each of the connections between the switches and the at least one shorting bar by cutting; and welding both ends of one of the auxiliary repair lines which correspond to the damaged signal line with both sides of one of the connections which correspond to the damaged signal line.