The invention discloses a method for robots to distinguish professional questions and usual questions. The method includes: acquiring a first question for a robot to recognize; inputting the first question into a question-answering system, subjecting the first question to word segmentation by a special word segmentation model, and outputting a second question; inputting the second question into the question-answering system, filtering the second question by a filter word table, and outputting a third question; if a set where the third question is located is blank, judging that the first question is a usual question, and entering a usual question processing system; if the set where the third question is located is not blank, judging that the first question is a professional question, and entering a professional question processing system. The invention also discloses a system for robots to distinguish professional questions and usual questions. The method and the system have the advantages that questions and answers of professional fields and usual conversations can be distinguished effectively, and accordingly the overall accuracy and question-answering efficiency of the question-answering system are improved.