The invention discloses a control method for inhibiting a continuous commutation failure of high-voltage DC power transmission based on harmonic detection, and belongs to the technical field of thermo-optic and electro-optic. The method comprises the steps: deducing control parameters of each harmonic control loop by a time area analysis method, and adding the control parameters into low-voltage current-limiting control of an original control system; when the high-voltage direct-current system has a commutation failure, detecting the voltage of the commutation bus, performing Fourier decomposition, and performing the inhibition of each harmonic component through a newly added harmonic control system, thereby achieving the purpose of inhibiting the subsequent commutation failure. Accordingto the invention, no primary equipment is added, and only a control system is improved, so the system transformation workload is low, namely, the cost is low; when a harmonic voltage of the system isdetected, the control method provided by the invention improves the performance of low-voltage current-limiting control (VDCOL) by reducing the influence of the harmonic component, achieves the effectof inhibiting the continuous commutation failure, reduces the risk of DC locking, and improves the safety and stability of system operation.