Information extraction method, and method and device for training question and answer processing model

The embodiment of the invention discloses an information extraction method and device and a method and device for training a question and answer processing model. According to the main technical scheme, the method comprises the steps of obtaining a to-be-extracted text and first target content corresponding to a first target type in the to-be-extracted text; inputting a first text sequence obtained by splicing the to-be-extracted text and the first prompt text into a question and answer processing model; obtaining a first answer text which is output by the question and answer processing model and contains second target content corresponding to the second target type; inputting a second text sequence obtained by splicing the to-be-extracted text, the first answer text and the second prompt text into the question and answer processing model; obtaining a second answer text which is output by the question and answer processing model and contains third target content corresponding to the third target type; wherein