The invention relates to a function call graph key node recognition and identification method based on complex network analysis. The method comprises the steps of carrying out lexical analysis, grammatical analysis and control stream analysis through a sound code static analysis technology, thereby obtaining source code call relationship data and function length data, and storing all data in a database in a classification mode; generating a call graph according to the obtained data, calculating node indexes of the call graph by employing a complex network analysis method, wherein the indexes comprise interaction degree, closeness centrality, node betweenness and function length, and calculating node key degree by employing a multi-attribute decision-making method; and through combination of user demands and state data stored in the database, calculating a key node rank and corresponding grey proportion data by employing the obtained node key degree data of the function call graph, and carrying out visual display. According to the method, the key nodes in the complex call relationship graph can be recognized and identified rapidly, and the working efficiency is remarkably improved.