Electronic cigarette oil leakage preventing device adopting light-induced reversible deformation layer and oil leakage preventing method

The invention provides an electronic cigarette oil leakage preventing device adopting a light-induced reversible deformation layer. The electronic cigarette oil leakage preventing device comprises a housing (12), a light source accommodation cavity (2) provided with a light source (1) in the inside and provided with a transparent light outlet wall (2-1), a light-induced reversible deformation layer (5) provided with a lighted side surface and a back-lighted side surface, and an elastic layer (6) tightly attached to the back-lighted side surface of the light-induced reversible deformation layer (5), wherein the lighted side surface faces the light source (1), an airflow outlet channel is defined between the lighted side surface of the light-induced reversible deformation layer (5) and the light outlet wall (2-1) and the housing (12), and an air inlet hole (8) and an air outlet hole (3) of the airflow channel are respectively formed in the housing (12), one end of every one of the two holes is fixedly connected with the light outlet wall (2-1) or the housing (12), the other end of every one of the two holes is attached to the lighted side of the light-induced reversible deformation layer (5), and therefore blocking of the airflow channel is formed.