An atomizing device of an electronic cigarette, comprising a main body , a heating device and a waterproof and breathable membrane , wherein the main body is provided with an air inlet , a suction port and an oil storage chamber , the main body forms an airflow channel between the air inlet and the suction port , the heating device is partially received in the airflow channel and is communicated with the oil storage chamber , the waterproof and breathable membrane is installed on the main body , and the waterproof and breathable membrane covers the airflow channel between the air inlet and the heating device ; characterized in that : the waterproof and breathable membrane comprises a base material with waterproof and breathable properties and an anti-wrinkle ring , the anti-wrinkle ring covers the edge of the base material so that when the base material is installed on the main body , the part of the base material not covered by the anti-wrinkle ring covers the airflow channel and forms a breathable part , and the breathable part is communicated with the airflow channel through an air path; the main body comprises a base body and a chassis ; the air inlet is provided on the chassis , the airflow channel forms an air passage hole communicated with the air inlet on the outer surface of the chassis , the chassis is further provided with an installing groove on the periphery of the air passage hole , the waterproof breathable membrane is installed in the installing groove , and the breathable part of the waterproof breathable membrane covers the air passage hole so that the breathable part is communicated with the air passage hole through an air path; and the suction port , the oil storage chamber and the heating device are received in the base body , when the base body is installed on the chassis , the base body covers the installing groove , and the heating device is communicated with the breathable part of the waterproof and breathable membrane . the waterproof and breathable membrane comprises a base material with waterproof and breathable properties and an anti-wrinkle ring , the anti-wrinkle ring covers the edge of the base material so that when the base material is installed on the main body , the part of the base material not covered by the anti-wrinkle ring covers the airflow channel and forms a breathable part , and the breathable part is communicated with the airflow channel through an air path; the main body comprises a base body and a chassis ; the air inlet is provided on the chassis , the airflow channel forms an air passage hole communicated with the air inlet on the outer surface of the chassis , the chassis is further provided with an installing groove on the periphery of the air passage hole , the waterproof breathable membrane is installed in the installing groove , and the breathable part of the waterproof breathable membrane covers the air passage hole so that the breathable part is communicated with the air passage hole through an air path; and the suction port , the oil storage chamber and the heating device are received in the base body , when the base body is installed on the chassis , the base body covers the installing groove , and the heating device is communicated with the breathable part of the waterproof and breathable membrane . <EOS>