Method for establishing audio classification model and method and device for automatically converting video

The invention relates to a method and a device for establishing an audio classification model, a server and a computer readable storage medium, and a method and a device for automatically converting avideo file into an audio file based on the model, the server and the computer readable storage medium, and relates to the field of big data and the field of audio and video processing in the artificial intelligence technology. The method for establishing the audio classification model comprises the steps of obtaining a plurality of audio files, wherein each audio file in the plurality of audio files has a corresponding text information introduction; determining the content classification of each audio file according to the text information introduction; calculating a scale index correspondingto the determined content classification; and establishing the audio classification model by taking the determined content classification and scale index as input. With application of the audio classification model, the video