The invention discloses a decoupling modeling method for dynamic response analysis of a high-speed railway pantograph-catenary coupling system. The method comprises the steps of contact network modelestablishment, pantograph model establishment, pantograph-catenary system coupling space model establishment, pantograph-catenary system decoupling space model establishment, nonlinear excitation linearization processing, exponential matrix fine algorithm and the like. A non-coupling motion equation of the high-speed pantograph-catenary system is established, an exponential matrix fine algorithm is adopted to obtain accurate expression of an equation homogeneous term solution, a linearization method is adopted to obtain linearization expression of a non-homogeneous excitation term, and therefore rapid and accurate simulation of kinetic analysis of the high-speed pantograph-catenary system is achieved. By applying the method provided by the invention, the sensitivity of high-speed pantograph-catenary system model simulation to the simulation step length can be effectively reduced, the calculated amount is reduced, the simulation time consumption is shortened, and the method has certainpracticability.