A method for manufacturing a display panel, a display panel, and a display device are provided. The method includes: forming a plurality of gate lines and a common electrode line pattern on a base substrate; forming an insulating layer on the base substrate on which the plurality of gate lines and the common electrode line pattern are formed; forming a via hole on the insulating layer; and forming a metal conductive pattern on the base substrate on which the insulating layer is formed. The common electrode line and the common electrode connection block located on two sides of a gate line are electrically connected through a bridging structure in a conductive layer made of metal, which reduces the resistance of the bridging structure, so that the voltage uniformity throughout the common electrode line pattern which is bridged through the bridging pattern is high.