The invention relates to an inter-station control method, device and system for multi-terminal flexible direct-current power transmission convertor stations. The method includes the steps: receiving monitoring information of remote control hosts of controlled convertor stations in communication connection with a current convertor station; acquiring selected controlled convertor stations, and providing corresponding control options according to the selected controlled convertor stations in a controllable state; acquiring the selected control options and generating preset commands corresponding to the selected control options to check the controlled convertor stations; generating control commands corresponding to the selected control options for the remote control hosts of the controlled convertor stations, and issuing remote control signals according to the control commands by the remote control hosts of the controlled convertor stations. According to the method, any convertor station can monitor and control the other convertor stations in communication connection with the convertor station in a remote control communication mode, so that the convertor stations can monitor and control each other.