The invention discloses a multiphase motor channel fault ride-through operation control method. With the multiphase motor channel fault ride-through operation control method adopted, when a certain orseveral channels fail, fault-tolerant on-line channel switching non-stop ride-through operation is realized; and during a process in which the channel fails or the failed channel is removed, the over-current protection of the inverter alternating-current side (motor winding side) of the remaining operating channels, the voltage stabilization control of the inverter direct-current bus-bar side ofthe remaining operating channels and inverter magnetic field compensation integrated coordination control are implemented. With the method adopted, fast, stable and safe fault-tolerant on-line channelswitching non-stop ride-through operation of a multiphase motor is realized. The method can be used for high-power electromechanical energy conversion occasions such as ship propulsion, track traction and wind power generation.