An image local contrast enhancement method includes: obtaining a first block where a pixel is located and a second block adjacent to the first block, and a gray scale source of a third block; obtaining a source gray scale of a fourth block opposite to the first block; respectively calculating a linear interpolation value according to the source gray scale and a distance between the pixel and the first block, the second block, the third block, and the fourth block; calculating a nonlinear interpolation value of the linear interpolation value by a nonlinear function; performing weighted calculation on the nonlinear interpolation value to obtain a target gray scale. The disclosure increases the diagonal blocks in the local gray scale adjustment, reflects the diagonal direction of the image, enhances the display effect of the local contrast in the smoothing process, enhances the edge image display effect, and improves the user experience.