An electrical connection method, substrate and display device. The electrical connection method is used for electrically connecting together a first conductive point (S1) and a second conductive point (S2) which are separated from each other on a substrate (10). The method comprises: a conductive polymer precursor film (20) is formed to physically connect the first conductive point (S1) and the second conductive point (S2); the conductive polymer precursor film (20) is subjected to polymerization processing so as to form a conductive polymer (21) which electrically connects the first conductive point (S1) and the second conductive point (S2). By means of the described method, repair cost is low, the repair time is short, and the performance of pixel units around a disconnected area is not affected.