Sonar target detection system and detection method

The invention is suitable for the technical field of sonar image processing, and provides a sonar target detection system, which comprises a sonar transmitter and a transduction receiver, and is characterized in that the output end of the transduction receiver is in data connection with a slope distance correction module for performing slope distance correction processing on an original image; the output end of the slope distance correction module is in data connection with an image preprocessing module for removing noisy points in an original image, the output end of the image preprocessing module is in data connection with an image processing module, and the image processing module comprises an image division module, a feature extraction module, a feature presetting module and a region evaluation module. The output end of the image preprocessing module is in data connection with the input end of the image division module, the output end of the image division module is in data connection with the input end o