The invention relates to a flying shear control method. When shearing is conducted continuously, the overall speed of rolling meets the equation that V=Vb+VC, wherein Vb=Vm*(1+Vm%), and Vc=Vm*K; the shear blade angle is alpha, when a shear blade is at the lowest point, the alpha is 0 degree, the addition speed coefficient K and the alpha meet equations that when alpha is greater than 340 degrees and smaller than or equal to 360 degrees, and alpha is greater than 0 degree and smaller than or equal to 20 degrees, K is equal to 0; when alpha is greater than 20 degrees and smaller than or equal to 160 degrees: K= , when alpha is greater than 160 degrees and smaller than or equal to 200 degrees: K= , when alpha is greater than 200 degrees and smaller than or equal to 340 degrees: K= , wherein R is the diameter of a roller, and L is the shearing length. The flying shear control method has the advantages that the shearing precision of band steel is improved, the shearing angle and torque are calculated precisely, accordingly, the shearing precision can be controlled, model calculating is completed, and the stability of shearing control is improved. The shearing angle is divided according to intervals, so that the addition speed coefficient K is evaluated precisely, and accordingly the shearing precision is improved.