Based on the two-temperature generalized magneto-thermal-viscoelastic theory considering scale effects and fractional time derivatives, the dynamic response of generalized magneto-thermal-viscoelastic theory in homogeneous isotropic semi-infinite elastic media with infinite conductivity is studied. Laplace Fourier integral transform and numerical inverse transform are used to solve the general solution of dimensionless physical equations. Based on the numerical results, the effects of time factor, fractional parameter and scale effect on the transient magneto thermic viscoelastic response of the structure are discussed respectively. The above results are visually expressed in the form of graphs. The results show that the temperature and displacement are less affected by each parameter, the stress increases with the increase of time, non-local and viscosity parameters, and decreases with the increase of fractional order parameters. This result is of great significance to the application of different physics fields, and provides some theoretical guidance for solving practical engineering problems.