The invention discloses a method and system for suppressing the torque ripple of a permanent magnet motor. The suppression method comprises the following steps of acquiring the torque of the permanentmagnet motor; obtaining the current component of the current of the stator of the permanent magnet motor in the q-axis according to the torque; obtaining the angle of the flux linkage of the rotor ofthe permanent magnet motor; constructing a ripple angle; subjecting the current component to rotation transformation; subjecting the first current to low-pass filtering on the d-axis; subjecting thesecond current to low-pass filtering on the q-axis; enabling a controller to output a first intermediate component by taking 0 as a reference and the first DC as the feedback; enabling a PI controllerto output a second intermediate component by taking 0 as a reference and the second DC as the feedback; perform reverse rotation transformation to obtain a compensation amount; and superimposing theinverted compensation amount onto the given amount of the current loop of the permanent magnet motor. The method directly targets the torque ripple, automatically adjusts the injection current harmonic given amount by a closed loop, and suppresses the torque ripple thoroughly.