The present invention relates to a photocatalyst air purification apparatus equipped with a turbo impeller, and more particularly, to a photocatalyst air purification apparatus equipped with a turbo impeller that sucks a large amount of air at high speed to effectively purify it and supplies it to the outside. The present invention, the main body is provided with an air inlet to the air is provided at the bottom and the air outlet to be purified air is discharged to the top； A first filtration filter installed at the air inlet and primarily filtering foreign matter contained in the introduced air； A second filtration filter installed on the lower side of the main body to secondaryly filter foreign substances contained in the primary filtered air； A shaft tube in which a lower portion is installed in communication with an upper portion of the second filtration filter and an inner diameter is reduced as it goes upward； An expansion tube in which a lower portion is installed to communicate with the upper portion of the shaft tube, and an inner diameter expands toward the upper portion and the upper portion communicates with the air outlet； An ultraviolet lamp installed inside the shaft tube and irradiating ultraviolet rays downward； It is installed on the inner lower side of the expansion tube and suctions the surrounding air of the main body through the air inlet at high speed to pass the first filter filter, the second filter filter, the shaft tube and the expansion tube in sequence to the air outlet. A turbo impeller discharging； It is installed inside the second filtration filter and the substrate coated with a photocatalyst is built-in so that it can be replaced or supplemented, and is sucked at a high speed by the turbo impeller. Secondary filtration is passed through the first filtration filter and the second filtration filter in sequence. A photocatalytic cartridge purifying the air through the reaction with the photocatalyst by the ultraviolet rays； a photocat
