The invention discloses an edge boosting method for images and is used to adjust the luminance of a target pixel of a digital image. The target pixel has an original luminance value. The method comprises that: the edge boosting operation is done to the target pixel to obtain an edge boosting luminance value of the target pixel. The target pixel is made an edge detection to obtain an edge direction of the target pixel. Then an adjustment range is determined according to the luminance value of at least one neighboring pixel neighboring the target pixel and along the edge direction. Then the edge boosting luminance value is adjusted according to the adjustment range to ensure that the adjusted edge boosting luminance value can not be over-bright or over-dark, the halo effect is suppressed, and the sharpness of the image edge is increased.