The invention discloses a correction parameter determining method, device and equipment, applied to automatic exposure control AEC correction. The method comprises the following steps: acquiring a theoretical correction parameter of a target system, wherein the theoretical correction parameter is a corresponding independent variable value when a dependent variable in a linear fitting function of the target system is a preset target dependent variable parameter, and the linear fitting function is a fitting function that the preset dependent variable parameter is in linear change along with a preset correction parameter; acquiring a first dependent variable parameter of the target system, wherein the first dependent variable parameter is obtained by carrying out AEC correction according to the theoretical correction parameter; and determining the theoretical correction parameter as a target correction parameter which is matched with the target dependent variable parameter when an error between the first dependent variable parameter and the target dependent variable parameter is within a preset error range. According to the embodiment disclosed by the invention, correction times are effectively reduced and the target correction parameter, which is matched with the target dependent variable parameter, is rapidly acquired, so that the correction parameter determining efficiency is improved.