The invention discloses an FPC (Flexible Printed Circuit board) for an OLED (Organic Light-Emitting Diode) light source, an OLED light source, and a connecting method of OLED light source leading-out electrodes. The FPC for the OLED light source comprises a baseplate, a first connecting electrode and a second connecting electrode, wherein the first connecting electrode and the second connecting electrode are arranged on the baseplate; the FPC is provided with a structure suitable for crimping a crimping area formed in an exposed electrode lead area of the OLED light source; after the crimping area is crimped, the first connecting electrode is electrically connected with a first leading-out electrode of an OLED light source screen body, which is used for leading out a cathode; the second connecting electrode is electrically connected with a second leading-out electrode of the OLED light source screen body, which is used for leading out the cathode; and welding spots are formed at one end of the first connecting electrode and one end of the second connecting electrode, which are far away from the crimping area. By adopting the invention, the FPC can be used for connecting more than two electrodes simultaneously, and achieve the connection of a plurality of leading-out electrodes on the OLED light source and external electrodes. The crimping process is reduced by half and the crimping technology is simplified.