The invention relates to a flexible DC power transmission hierarchical control method, and belongs to the field of flexible DC power transmission. The control system is divided into three layers of system level control, converter station level control and converter valve level control. The system level control layer is divided into active class control and reactive class control. Active class control includes the method of active power control, frequency control and DC voltage control, and reactive class control includes the method of reactive power control and AC voltage control. The converter station level control layer is divided into two classes of indirect current control and direct current control. Indirect current control is that the deviation of the state quantity acquired in realtime and the reference value outputted by the system is inputted to a control module and the phase angle delta and the modulation ratio M are obtained through a PI regulator. The direct current control mode is divided into two parts of inner ring current control and outer ring voltage control. The inner ring current control strategy is a double closed loop control system. Current state feedback control is introduced to the current inner ring so as to realize decoupling of the active current and the reactive current.