The invention discloses a construction method for a secondary equipment simulation model of an electric power system. The construction method comprises the following steps: (1) generating a training simulation system flexible bus; (2) drawing the appearance of the secondary equipment; (3) analyzing properties and functions of the secondary equipment; (4) analyzing input data and output data of the secondary equipment, ordering the input data of the secondary equipment from the training simulation system flexible bus, and defining the output data; (3) defining appearance logic node of the secondary equipment; (6) expanding the incidence relation between inside properties of the secondary equipment simulation model, expressing inside mechanism of model behavior, and realizing the defining of the properties and the functions; (7) storing the generated secondary equipment simulation model in a secondary equipment model base. The method can describe the physical property mechanism of the secondary equipment in detail, accurately simulate all appearance properties and action properties, and meets practical requirements of quick configuration and deployment.