The invention relates to an electromagnetic transient simulation modeling method of a control and protection system for an ultra high voltage direct current transmission project. The method comprises the following steps: A calculating time series; B compiling modules; C calling the modules; D triggering pulse control; E building a one-time system model; F carrying out comparison of wave shapes. Compared with the prior art, according to the method, the logic of the built particular electromagnetic transient simulation model of the ultra high voltage direct current control and protection system based on PSCAD/EMTDC is in complete accordance with that of a control and protection system of a practical project; the simulation result is in accordance with actual wave recording curves; the simulation model can directly run on a computer based on the Windows operating system; the modification of the model is convenient and flexile; and the method can be used in the processes of projection, design and construction of the ultra high voltage direct current transmission project, and provides fast and accurate technical support for debugging and actual operation of the system.