Aiming at the inadequacy of traditional 2D empirical mode decomposition in acquiring image details, the improved BEMD image enhancement algorithm based on local gradient extreme point is proposed. Based on the strong ability of gradient to mine image detail information, according to four 2D extreme conditions of pixel point to find out image local extreme point, carry out empirical mode decomposition of image and ascertain connotation mode function, combine with large-scale gradient preservation and small-scale gradient removal, achieve the purpose of image enhancement and noise suppression. The experiment results show that the proposed method has better detail capture ability than the traditional image enhancement algorithm.