The present invention belongs to the field of power grid model dispatching automation, and particularly relates to a power grid splicing boundary correctness verification method. The method comprises the following steps: (1) by using model splicing boundary information, searching for a station which a boundary device belongs to, and defining the station containing the boundary device as a boundary station; (2) verifying validity of a terminal device of the boundary station; (3) performing classification on the boundary station by type, and determining an inner endpoint and an outer endpoint of the boundary station in a corresponding manner according to different types; (4) topologically traversing all external network stations from an outer terminal to an external network segment to the outer terminal; (5) if the inner endpoint of the boundary station is traversed during the traversing process, determining topological traversing to be wrong, and determining that boundary definition is wrong; and (6) if traversal of all boundary stations is completed, and no error appears, determining that the boundary definition is correct. The method provided by the present invention ensures validity and integrity of splicing boundary setting of the power grid model.