The invention discloses a space sector pulse width modulation (SVPWM) control method of a fast multilevel inverter, and belongs to inverter control methods. The control method includes the following steps that a, transformation of coordinates is carried out, and vector coordinates are converted into integers; b, preliminary calculation is carried out on coordinates of even number complement vectors closest to vertexes of reference voltage vectors; c, the coordinates obtained in the step 2 through calculation are corrected; d, the reference voltage vectors are decomposed; e, polarity judgment and action time calculation are conducted; f, on-off state calculation is carried out and drive pulses of the inverter are generated. The control method has the advantages that sector judgment and table look-up are needless, trigonometric functions and root sign operations do not exist, and only simple addition, subtraction and multiplication are needed; on-off states of various phases can be obtained directly through simple calculations, the number of programming codes is small, and the operating speed of a system is improved; the control method can be applied to inverters of random levels, and the calculated quantity is slightly increased along with increasing of the number of levels.