A workflow UI generating method and generator. A method according to an embodiment includes: creating and deploying a workflow UI definition file which comprises the mapping relationships between workflow data items, workflow participating roles, workflow activities, and workflow UI elements and their attributes; during the execution of the workflow: determining the workflow participating role to which the current user belongs; determining the current workflow activity of the workflow participating role; reading and parsing the workflow UI definition file, and obtaining workflow data items corresponding to the workflow participating role and its current workflow activity as well as corresponding workflow UI elements and their attribute according to the determined workflow participating role and its current workflow activity as well as the read and parsed mapping relationships; obtaining the values of the data items from a workflow engine; and generating and presenting to a user a workflow UI which comprises the workflow UI elements corresponding to the workflow data items and having the values of the data item and the attributes, and which can interact with the workflow engine through a workflow engine interface.