The utility model discloses a device for removing indoor air particulate matters through a wet method. The device comprises a casing provided with a left chamber and a right chamber which are partitioned through a baffle, wherein an air inlet channel and a separation channel which are mutually communicated are formed in the left chamber, the baffle is a lateral wall on the separation channel and opposite to the air inlet channel which is provided with an air inlet, and an ultrasonic wave atomizer is arranged in the air inlet channel and equipped with an atomization water tank containing atomization liquid. A dust-laden waste water collection tank is arranged at the lower portion of the separation channel, and a steam-water separator is arranged at the upper portion of the separation channel. The upper portion of the right chamber is communicated with the steam-water separator, the lower portion of the right chamber is provided with a cleaning and humidifying water tank, and a cleaning and humidifying rotary plate is arranged in the cleaning and humidifying water tank. The right chamber is provided with an air outlet, an exhaust fan is arranged in the air inlet, and/ or a blower is arranged in the air outlet. The device for removing indoor air particulate matters through the wet method has the advantage of good air purification effect.