A substantiation of the collocation method for the system of integral equations in the problems of shielding electromagnetic fields for cylindrical bodies is given. The system of integral equations is approximated at specially chosen points by a system of algebraic equations, for which the existence and uniqueness of a solution are established. The convergence of the solution of the resulting system of algebraic equations to the exact solution of the system of integral equations is proved, and the rate of convergence of the method is indicated.