Edge detection plays an important role in laser ladar image processing. Its capability has direct influence on precision and performance of ladar imaging system. Considering the features of laser radar image, this paper raises a method based on wavelet transform and mathematical morphology to process the laser radar image. Firstly, using the wavelet theory and the multi-scale wavelet decomposition strengthens the weak parts of the image edge appropriately. Then, we do edge detection from the perspective of gray morphological and get the edge information. Matlab is used to perform the experimental simulation. The results show that adding edge detection operators in laser radar image processing gets better effects than only using wavelet or morphology. The theory proposed in the paper has great effects in edge accuracy, strong and weak edge extraction and noise suppression.