The invention discloses a controllable dynamic sliding scanning excitation method for seismic sources in the process of acquiring seismic data. A coordinate system of taking the distance D between every two seismic sources as an abscissa axis and taking a time interval T between a front cannon and a rear cannon as a longitudinal axis is established; alternative scanning points, sliding scanning points and simultaneous scanning points are connected to form a dynamic sliding scanning curve; the adjustment of the excitation is realized according to the values of the distance D between every two seismic sources and the time interval T between the front cannon and the rear cannon. According to the method disclosed by the invention, by the method of adopting different excitation modes under the conditions of setting different distances of the seismic sources and the time intervals, the proportion that the seismic sources simultaneously vibrate can be improved, the time interval of blasting time of the two cannons is compacted on the whole, and further the blasting efficiency is greatly improved.