The invention discloses a multi-direct-current coupling degree evaluation method considering about direct current dynamic property itself, which includes steps of considering that inductance value ofa direct current reactor is a finite value and the linear line is existed with the reason of time delay of a capacitor and a rectifying side direct current adjuster during the alternating current failure period when the voltage at the direct-current line current conversion bus is changed; confirming the direct current change volume before the direct current adjuster at the rectifying side is not acted at the early period of fault; according to the determined direct current change volume, calculating a multi-feed-in voltage interactive factor at the current conversion busbar; confirming a coupling degree of direct current lines of a receiving power grid according to the multi-feed-in voltage interactive factor. The multi-direct-current coupling degree evaluation method has the beneficial effects that the simulation indicates that the voltage interactive factor calculation method considering about the direct current change is closer to the time domain simulation result.