The invention provides a wearable air purification device. The wearable air purification device comprises a wearing part, a filter element arranged in the wearing part, a power source arranged in the wearing part and used for driving outside air to flow towards the filter element, a cover part capable of covering the nose or the mouth and nose of a human body and an air supply pipe used for conveying air filtered by the filter element into a cavity, wherein the cover part is provided with the cavity, and the cavity communicates with the nose or the mouth and nose of the human body and is provided with a ventilation mechanism. According to the wearable air purification device, the power source is adopted for actively driving the filtered outside air to enter the cavity, the problem of breathing air resistance is avoided, and after the power source conveys the filtered air to the cavity through the air supply pipe, flowing of the air in the cavity can be driven; and partial airflow circulation is formed in the cavity, and therefore steam, generated due to breathing, in the cavity can be guided out to the outside through the ventilation mechanism, and the problem that the steam is accumulated in the cavity to cause bacterial breeding is effectively avoided.