The invention discloses a new method and a device for air purification. The device comprises an enclosure (1), a charge electrode grid (3), multi-stage adsorption accelerating grids (4-1, 4-2, 4-3 and the like), a negative ion emitter (5), an ozone decomposition unit (6), a high-frequency high-voltage power supply (2) and the like, wherein the charge electrode grid (3), the multi-stage adsorption accelerating grids (4-1, 4-2, 4-3 and the like), the negative ion emitter (5) and the ozone decomposition unit (6) are arranged in the enclosure (1). When high air quantity is needed, a fan can be arranged in front of the charge electrode grid (3) or in front of an air outlet. The device is characterized in that: in the enclosure, the (3), the (4-1, 4-2, 4-3 and the like), the (5) and the (6) are sequentially arranged in the direction from an air inlet to the air outlet. The (2) is arranged in a closed space. An electric field is arranged downwind or upwind in the direction from the charge electrode grid (3) to the negative ion emitter (5). The field intensity is of gradient. The high-frequency high-voltage power supply (2) has multi-stage voltage output. When the electric field is arranged downwind, the high-voltage '+' pole is connected with the (3), and the high-voltage '-' pole is connected with the first, second and third adsorption accelerating poles (4-1), (4-2) and (4-3) and the negative ion emitter (5) respectively. When the electric field is arranged upwind, the poles of the (2) are connected reversely, and the (5) is removed at the same time. The device has simple and reasonable integral structure, is sufficient to decompose and adsorb pollutants, generates more negative oxygen ions, and is convenient to clean.