The invention relates to a multiport direct-current transmission power coordination control method. An independent multiport controller is arranged in a multiport direct-current electricity transmission system formed by three or more converter stations connected in parallel, a master / slave control structure is adopted to achieve coordination of controllers in the converter stations, the multiport controller serves as a main controller to take charge of power / current definite values of the converter stations, and various converter station pole controllers serve as slave controllers to achieve power / current control of the converter stations. The fact that the whole direct-current system has a stable operation range is guaranteed. The multiport direct-current transmission power coordination control method can meet configuration and switching requirements for normal operation and an operation mode after a fault of the multiport direct-currnet electricity transmission system. When the multiport direct-current electricity transmission system breaks down, if current commands still keep balanced after a certain converter station or a section of a circuit is removed, the rest of the stations of the multiport direct-current electricity transmission system can still operate, and quick recovery of the system after the fault is removed is achieved.