The invention provides a control apparatus for a multi-pole flexible direct current power transmission system. The control apparatus comprises a multi-pole control layer, a pole control layer and a converter valve control layer which are connected in sequence, wherein the multi-pole control layer is used for coordinately controlling active power and reactive power of multiple flexible direct current poles to realize a general control object for active power and reactive power of a full station; the pole control layer is used for completing independent control on active and reactive power of single flexible direct current poles; and the converter valve control layer is used for completing control on a converter. The invention also discloses a control system and a control method for the multi-pole flexible direct current power transmission system. All in all, coordinative control for the multiple flexible direct current poles can be realized, and overall control requirement on the operation of actual multi-pole flexible direct current power transmission engineering can be satisfied.