The invention discloses a method for manufacturing a hidden seamless airbag door of a leather multi-layer automobile dashboard. In the method, a U-shaped weakening line arranged on a leather layer and the weakening line arranged on the upper surface of a three-dimensional non-woven layer can smoothly pop an airbag in a given time after the airbag bursts a metal airbag frame and a foamed area, so that the security of people in an automobile can be timely protected. The product manufactured by the method has high-grade and attractive appearance; and the whole dashboard has better handfeel, higher structural integrity and higher performance in airbag bursting tests so as to better protect the security of the people in the automobile.