The present disclosure relates to a color filter substrate, a display panel and a display device. The color filter substrate includes a conductive layer located at a side of the color filter substrate where a color filter is located, a peripheral region of the conductive layer is provided with an isolation band configured to isolate external static electricity, the isolation band is provided with a breach, an inside portion of the conductive layer located inside the isolation band is provided with an extending portion configured to export static electricity, and the extending portion is extending to an edge of the color filter substrate through the breach.