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The three-phase voltage-type PWM rectifier is a strong nonlinear structure with multi-input and multi-output. The mathematical model and active disturbance rejection controller of the three-phase voltage-type PWM rectifier are analyzed.In order to improve the nonlinear, disturbance rejection and parameter perturbation control problems in the rectifier system, an improved nonlinear active disturbance rejection control scheme is adopted and its discrete form is given. Then, the nonlinear functions of NLSEF and ESO in conventional active disturbance rejection controllers are reconstructed to overcome the non-smooth performance of the nonlinear functions and reduce the high frequency chatter phenomenon of the rectifier output. Through MATLAB/Simulink simulation analysis and experimental prototype verification, the improved ADRC is compared with conventional ADRC. The results show that the new ADRC has better dynamic and static characteristics, and improves the disadvantages of conventional ADRC system sensitivity to AC side voltage and load mutation. In addition, the Total harmonic distortion (THD) is decreased and the DC voltage is more robust.