Because of the influence of track irregularity and vibration, the milling force of the electrical drive railmilling equipment will fluctuate in the milling process. It may lead to the decline of the milling precision. To restrain the fluctuation of the grinding pressure, a controller which consists of two parts was designed. Based on the principle of vector controlling, the motor speed control system used to stabilize motor speed was designed. Based on a “disturbance estimator” (loadtorque estimator) and “system online identification model” (a “no time delay loadcurrent model” based on “wavelet neural network”), the “smithcontroller” used to stabilize the milling force was designed. The simulation result indicates that: compared with PID control, the controller designed in this paper could achieve a fast tracking and response of the step input without overshoot and oscillation. And in the whole control process the current of the grinding motor, which reflects the grinding force, waves within a small scale. And it shows that the controller could restrain the external interference effectively.