The invention discloses a control system and method for an AC-DC matrix converter. An existing AC-DC matrix converter control method is improved, PWM is realized by calculating and regulating controltime parameters, the working frequency is fixed, output power is changed by adjusting the duty ratio, on the one hand, filter design difficulty caused by pulse density modulation is solved, and on theother hand, since 0-voltage excitation is adopted, high-frequency devices can be used, and the power density of the converter can be further increased.