The invention relates to a Profibus-DP-based high voltage direct current transmission control data monitoring method. The method comprises the following steps: S1, extracting the message data of the target controller of a high voltage direct current converter station; S2, determining the category and name of the target controller to obtain the structure of the message data; S3, locating the message required to be monitored according to the structure of the message data and reading the value of the message in the message data; and S4, formulating the general data table of the control system of the high voltage direct current converter station. When the method is used for control data monitoring, no technician is required to run to the front of independent equipment to copy the state of the independent equipment. The method realizes simultaneous and real-time monitoring of the control data of a great number of controllers at the same spot, so that the efficiency of the control data monitoring is multiplied.