Oil leakage prevention structure and electronic cigarette cartridge

The utility model provides an oil leakage prevention structure and an electronic cigarette cartridge, and belongs to the technical field of electronic smoking sets. The oil leakage prevention structure comprises a one-way valve, an oil leakage prevention device and a control device, and the one-way valve is arranged in an airflow channel of the electronic cigarette cartridge; and an outlet part is arranged on one side, facing the air outlet of the air flow channel, of the one-way valve, and the outlet part can be selectively opened or closed so as to prevent residual smoke and condensate in the air flow channel from flowing out of the air hole in the lower part of the electronic cigarette cartridge. According to the oil leakage prevention structure, the one-way valve is arranged, the outlet portion of the one-way valve can be selectively opened or closed, gas can be guided out of the gas inlet of the electronic cigarette cartridge airflow channel to the gas outlet, and therefore residual smoke in the cigarett