An air purifier comprising a housing provided with an air inlet and an air outlet ; a filter module ; a drive module and a processing module are sequentially arranged in the housing along an airflow direction; the drive module is used to drive the air to flow from the air inlet to the air outlet ; the processing module in turn comprises a Titanium dioxide plate and an LED light plate sequentially installed in the housing along the airflow direction; and the LED light plate irradiates the Titanium dioxide plate , the LED light plate irradiating UVA and UVC; characterized in that the housing is provided upright; the housing comprises an inner housing and an outer housing sleeved outside the inner housing ; a plurality of the air inlets are provided on an outer wall of the outer housing along the circumferential direction of the outer housing ; the air outlet is provided on an upper end of the outer housing and communicated with an inner cavity of the inner housing ; a lower end of the inner housing is provided with an air guide port communicated with the inner cavity of the inner housing ; an outer wall of the inner housing is provided with convex edges along its length direction; the convex edges , the outer wall of the inner housing and an inner wall of the outer housing form a diversion cavity communicated with the air inlet and the air guide port ; and the filter module , the drive module and the processing module are located between the air guide port and the air outlet , and a power supply module is provided between the filter module and the drive module and is installed inside the inner housing , the power supply module comprises a series of battery units that are disposed along the circumferential direction of the inner housing and a mounting seat that comprises a mounting sleeve sleeved outside the battery unit , one mounting sleeve corresponds to one battery unit , and the mounting sleeve is fixedly connected with the inner wall of the inner housing , and a passageway is formed between the mounting sleeves and the battery units , and air from the air inlet to the air outlet flows through the passageway . the housing is provided upright; the housing comprises an inner housing and an outer housing sleeved outside the inner housing ; a plurality of the air inlets are provided on an outer wall of the outer housing along the circumferential direction of the outer housing ; the air outlet is provided on an upper end of the outer housing and communicated with an inner cavity of the inner housing ; a lower end of the inner housing is provided with an air guide port communicated with the inner cavity of the inner housing ; an outer wall of the inner housing is provided with convex edges along its length direction; the convex edges , the outer wall of the inner housing and an inner wall of the outer housing form a diversion cavity communicated with the air inlet and the air guide port ; and the filter module , the drive module and the processing module are located between the air guide port and the air outlet , and a power supply module is provided between the filter module and the drive module and is installed inside the inner housing , the power supply module comprises a series of battery units that are disposed along the circumferential direction of the inner housing and a mounting seat that comprises a mounting sleeve sleeved outside the battery unit , one mounting sleeve corresponds to one battery unit , and the mounting sleeve is fixedly connected with the inner wall of the inner housing , and a passageway is formed between the mounting sleeves and the battery units , and air from the air inlet to the air outlet flows through the passageway . <EOS>