The invention relates to a method for automatically checking the unclosed graph of a stamping die, comprising the following steps: a graph to be checked is selected from a graphic database; whether the graph is provided with attribute information is decided, wherein, the attribute information comprises information on whether the graph is closed; if the graph is provided with the attribute information, whether the attribute information comprises corresponding information indicating that the graph is closed is decided; when the attribute information of the graph comprises the corresponding information indicating that the graph is closed, coordinates of a starting point and an ending point of the section graph of the graph are read; the coordinates of the read starting point and the ending point are compared to ensure that whether differences exist to a certain extent. In addition, an automatic unclosed graph checking system for stamping die is also provided by the invention.