The invention relates to an integral-variable bicirculating mapping pulse width modulation method of a modularized multi-level converter. In a circuit topology structure of the modularized multi-level converter (MMC), an upper bridge arm and a lower bridge arm are respectively provided with N sub-modules. The integral-variable bicirculating mapping pulse width modulation method of the modularized multi-level converter comprises the following steps of normalizing modulating waves to a zone (-1,1), dividing the modulating waves into N sections and then processing, obtaining 2N PWM (pulse width modulation) output according to preset output and integral comparison, complementation and modulation, then distributing 2N PWM output to 2N sub-modules through the bicirculating mapping selection, and enabling the MMC (modularized multi-level converter) to output voltage waveforms of the modulating waves, wherein the capacitor voltage fluctuation of a MMC circuit is taken as feedback quantity to be fed back to the integral comparison, complementation and modulation so as to stabilize the capacitor voltage fluctuation. The modulation method provided by the invention can be used in the control signal modulation of the MMC in the occasions with middle and high voltage and high power.