The invention provides a method for automatically converting electromagnetism transient models and element pictures from a PSCAD (power system computer aided design) to an ADPSS (advanced digital power system simulator). The method comprises the following steps of determining coordinates of endpoints of elements; performing topology analysis to determine a connection relation between the elements; automatically generating an electromagnetism transient model of the ADPSS; and forming an intermediate file of the ADPSS. By the method for automatically converting the electromagnetism transient models and the element pictures from the PSCAD to the ADPSS, the existing data files of which the format is PSCAD are directly converted into intermediate data files of a simulation procedure of the ADPSS, and the purpose of efficiently and accurately simulating and analyzing a large-scale alternating-current and direct-current power system is achieved.