The embodiment of the invention discloses a self-timer light supplementing method and device, a system, a mobile terminal and a self-timer stick. The method comprises the following steps: when triggering of a self-timer light supplementing event is monitored, controlling a distance sensor on a bracket of the self-timer stick to measure a distance between the bracket and a user, wherein the bracket is used for fixing the mobile terminal; determining light supplementing parameters of at least one group of light supplementing lamps on the self-timer stick according to a measurement result of the distance sensor, wherein each group of light supplementing lamps comprises at least one light supplementing lamp; and controlling the at least one group of light supplementing lamps to supplement light according to corresponding light supplementing parameters. Through adoption of the technical scheme in the embodiment of the invention, the light supplementing lamps on the self-timer stick can emit light of different proper brightness according to different distances between the mobile terminal and the user; the self-timer light supplementing effect can be improved effectively; and the quality of self-timer photos is enhanced.