The invention discloses a separation type atomization device and a container thereof, the container being used for being separably mounted on an atomization seat. The container comprises a cup and a flexible membrane. An opening is formed at one end of the cup, and the flexible membrane covers the opening of the cup. The flexible membrane comprises a tension region and an outer ring region surrounding the tension region; a plurality of atomization holes having an average pore size between 1 micron and 20 microns are formed on the tension region, and the outer ring region is fixed to the cup. When the cup is mounted on the atomization seat, the tension region of the flexible membrane can be pressed by the atomization seat to increase the tension value from an initial tension value to an atomization tension value, so that the average size of the atomized particles passing through the plurality of atomization holes of the tension region is less than a preset value. Accordingly, the cup and the flexible membrane that are often required to be replaced are independent of the atomization seat, and an expensive vibration device is provided on the atomization seat, facilitating extending ofthe service life of the separation type atomization device.