Test case generation method and device based on large model

The invention discloses a test case generation method and device based on a large model. The method comprises the steps that a to-be-tested item interface file is acquired; extracting to-be-tested item information from the to-be-tested item interface file; constructing a description generation instruction based on the to-be-tested item information, and constructing a first formatting instruction at the same time; adopting a large model to generate a description file and an application scene in response to the description generation instruction based on the to-be-tested item information, and outputting the description file and the application scene in response to the first formatting instruction; obtaining a demand file; extracting demand information from the demand file through semantic recognition; constructing a use case generation instruction based on the demand information, and constructing a second formatting instruction at the same time; and calling the description file and the application scene to gene