Abstract: The present invention discloses an air purification apparatus. The air purification apparatus comprising: a casing which contains at least one apparatus air inlet and at least one apparatus air outlet; at least one main filter which is being installed at the apparatus air inlet and/or within the casing; at the periphery of the main filter, there locates a primary air flow inlet and a secondary air flow inlet. When a primary air flow is drawn to flow from the upstream to the downstream positions inside the casing, the primary air flow is adapted to pass by at least one edge of the exterior of the main filter, resulting at least two exterior surfaces of the main filter being exerted with different atmospheric pressures. Through the secondary air flow inlet, a secondary air flow is entrained through the main filter and flows from its exterior surface is exerted with higher atmospheric pressure to its exterior surface is exerted with lower atmospheric pressure.