The invention belongs to the technical field of electrical power system automation, in particular to an RTDS-based double-bus protection dynamic simulation experimental method. The RTDS-based double-bus protection dynamic simulation experimental method comprises the steps of: connecting a hardware board card in an RTDS machine cabinet (RACK) with peripherals required in experiment; connecting a synchronization line of a GTWIF on the RACK to a HUB; generating a configuration file config_file by reading a hardware configuration file via RSCAD, carrying out double-bus protection primary system modeling, secondary simulation quantity output modeling and switching value closed-loop control logic modeling, allocating resources according to the configuration file, compiling models to generate a drft file after modeling and downloading the drft file into the RTDS hardware board card; and carrying out dynamic simulation experimental system configuration, generating a configuration file and running the configuration file in a Runtime menu in the RSCAD software in real time, simulating various types of faults, and investigating action and behavior of a double-bus protection device. The RTDS-based double-bus protection dynamic simulation experimental method has the advantages of being universal in the models, being capable of changing fault occurring position flexibility, and achieving closed-loop control of switching value.