The invention discloses a seine object fish shoal tracking method based on horizontal fishgraph images. Through obtaining echo signals of a fishgraph, a seine object fish shoal is tracked, a movement locus is predetermined, and thus the success rate of seine fishing is improved. According to the invention, through adjusting the inclination angle of a sonar, changing the emission direction of sound waves and performing 360-degree rotation, underwater three-dimensional space can be scanned, three-dimensional images are drafted, the quantity of fish shoals is estimated in a stereo mode, and effective help is provided for development of fish resources.