In view of the problems of term nesting, polysemy and error propagation between extraction subtask tasks, a deep attention model framework was proposed. First, the annotation strategy was used to jointly learn two sub tasks of knowledge extraction for solving the problem of error propagation. Second, a projection method combining multiple word vector information was proposed to alleviate the polysemy problem in term extraction in coal mine field. Third, a deep feature extraction network was designed, and a deep attention model and two model enhancement schemes were proposed to fully extract the semantic information. Finally, the classification layer of the model was analyzed to simplify the model to the maximum extent under the premise of ensuring the extraction effect. Experimental results show that, compared with the best model of coding-decoding structure, the proposed model has the F1-score increased by 1.5 percentage points and the model training speed improved by nearly 3 times. The proposed model can effectively complete two knowledge extraction subtasks which are term extraction and term relationship extraction in coal mine field.