The invention provides a processing method for improving the quality of canned edible mushrooms. The processing method comprises the following process flows of preparing for raw materials (dried edible mushrooms), re-watering, fixing colors, spin-drying, tumbling and seasoning in vacuum, packaging in vacuum, sterilizing at high temperature under high pressure and storing. According to the processing method for improving the quality of the canned edible mushrooms, the greatest obstacle of brown stain of dried products is overcome, and the canned edible mushrooms have the advantages of high production efficiency, long storage time, instant eating after opening bags, nutrition and delicious taste, can be subjected to mass industrial production and has the characteristics of the edible mushrooms and the function of health care. According to the processing method, a compound color fixative and carboxymethylcellulose with a certain concentration are adopted to treat, by combining a vacuum tumbling process, a proper process is adopted by aiming at different small pack snack canned edible mushrooms, and snack soft cans having good quality and a long shelf period can be finally obtained; and various defects caused by severe brown stain or irrigation treatment of a product sterilization process are overcome.