The invention relates to a hybrid simulation-based electromagnetic direct-current model automatic adjustment method and system. The method comprises the steps of obtaining initial running condition information from electromagnetic side power flow data, and assigning initial values to initialized information components of a pre-built electromagnetic direct-current model; based on control process parameters of the information components in the initial running condition information, adjusting a current running state of the electromagnetic direct-current model; and when current running state dataafter adjustment is consistent with the electromagnetic side power flow data, switching off a clamping power supply on a converter bus, thereby enabling the electromagnetic direct-current model and anelectromechanical side power grid to form a closed loop through a hybrid simulation interface, and starting hybrid simulation. Therefore, quick and automatic adjustment of running conditions of the electromagnetic side direct-current power transmission model in electromechanical-electromagnetic hybrid simulation of a large-scale alternating-current and direct-current power grid is realized; the workload of manual adjustment of running modes of the electromagnetic direct-current model during the hybrid simulation of the alternating-current and direct-current power grid is greatly reduced; quick adjustment of the running modes of the direct-current electromagnetic model is realized; and the simulation efficiency is remarkably improved.