The invention discloses an indoor air purifier. The indoor air purifier comprises an outer machine shell and an inner machine shell. The inner machine shell comprises a cylindrical water bucket, and an annular partition plate is formed at the bottom of the water bucket. A water storage barrel is formed on the part, located on the inner circumference of the annular partition plate, in the water bucket. A waste water storage barrel is formed on the part, located on the outer circumference of the annular partition plate, in the water bucket. A flow guiding barrel is arranged on the annular partition plate. A water curtain water inlet connector is formed in the middle of the bottom of the water storage barrel. A water pumping connector is formed at the position, different from the water inletconnector, of the bottom of the water storage barrel. A waste water connector is formed at the bottom of the waste water storage barrel. A filter and a water pump are further arranged in the space between the outer machine shell and the inner machine shell. A first water spraying pipe is inserted and connected in the upper portion of the water curtain water inlet connector, and a plurality of water curtain generators are connected to the upper end of the first water spraying pipe in series in the longitudinal direction. Water curtains can be formed through water via the water curtain generators. The indoor air purifier is good in air purification effect, capable of saving energy and environment-friendly.