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An operator-based robust perfect tracking control for a direct current servo control system with uncertainties is proposed by using robust right coprime factorization approach. In general, there exist modelling errors in nonlinear characteristics and parameter identification of the direct current servo control system and external disturbances in real situations. In the present control system design, the effect of the modelling errors and external disturbances on system performance is considered to be uncertainties in the direct current servo control system. Considering the uncertainties, a robust perfect tracking control by using robust right coprime factorization is studied. That is, first, considering the unknown uncertain plant generates limitations in obtaining perfect tracking conditions, an operator-based feedback control scheme is designed, and the effect of uncertain plant is eliminated by the proposed control scheme. Based on the obtained conditions, a robust perfect tracking control system based on robust right coprime factorization is designed, and new perfect tracking condition is obtained. The result of the simulations indicates that the proposed method can eliminate uncertainties effectively and make the servo system have strong robustness and perfect tracking ability.