The invention provides a method for assisting in hydrolyzing chitin through microwaves to prepare D-glucosamine hydrochloride, and belongs to the technical field of medicine and health care product raw material production. The method includes the steps of assisting hydrochloric acid in conducting acidolysis through microwaves with crude chitin as starting raw materials, refining hydrolysate through the microfiltration and ultrafiltration membrane combined separation technology so as to filter out impurities and macromolecule substances, and conducting concentration and crystallization to obtain the D-glucosamine hydrochloride product. Chitin can be rapidly hydrolyzed through the microwave-assisted acidolysis technology under the low acid concentration (10%-15%), the hydrolysis rate can reach up to 90% or higher, the microfiltration and ultrafiltration membrane combined separating and refining technology is adopted for hydrolysate, and the technical problems that a traditional hydrolysis process is high in production cost, low in efficiency and high in waste emission are solved.