The invention discloses a method and a device for structural body definition and structure output, and relates to automatic code generation technology. According to the method and the device for the structural body definition and the structure output, various attributes of user defined structures are configured in an Excel template file according to user needs, and an integrated structural body description configuration file is generated; nested and multiplex relationships between structural bodies are analyzed and extracted from the configuration file, and the structural body attributes and the relationships between the structural bodies are combined to generate a configuration database of structural body configuration; a structural body attribute list in the configuration database is traversed, each structural body attribute is found, a structural body definition file is generated according to programming language specifications, a structure content print file of the structural bodies is generated through the iterative method according to the relationships between the structural bodies, stored in the database. The invention further discloses the device for carrying out the method at the same time. With the method and the device, efficiency of user defined structural body definition and maintenance in process control system development is greatly improved.