The invention discloses a complex background image local contour information identification method based on a Tophat algorithm. The complex background image local contour information identification method comprises the following steps: selecting pictures to be identified, carrying out image feature extraction on the pictures through even tree complex wavelet transform, recognizing the local contour information of the image after the image feature extraction by using a Tophat algorithm, completing image contour information identification, outputting the pictures, and eliminating background false alarm information of the images through dual complex wavelet transform so as to obtain more multi-scale detail features. Due to the complex background image local contour information identificationmethod, the image background inhibition effect can be realized through morphological filtering algorithm calculation, and image contour identification precision, identification time and image identification degree can be effectively improved, and the complex background image local contour information identification method is more practical.