The invention discloses a modular double
fluidized bed ion exchange device, which comprises a standardized box body, wherein, the box body is of a rectangle, both ends of the box body are respectively and vertically provided with three identical connecting short pipes with flanges, a fixed upper
ion exchange resin
bed and a fixed lower
ion exchange resin
bed are arranged in the box body, the upper
ion exchange resin
bed is positioned between the upper connecting short pipes and the intermediate connecting short pipes, the lower
ion exchange resin bed is positioned between the intermediate connecting short pipes and the lower connecting short pipes, the intermediate connecting short
pipe on the front end of the box body is an inlet of water to be treated, the upper connecting short
pipe and the lower connecting short
pipe on the rear end of the box body are water outlets after
ion exchange, the upper connecting short pipe and the lower connecting short pipe on the front end of the box body are inlets of
backwashing water, and the intermediate connecting short pipe on the rear end of the box body is an outlet of the
backwashing water. The device can be arbitrarily assembled with treatment devices of other box bodies with the same specification, which contributes to reducing cost, being convenient for installation, guaranteeing the
treatment effect of water, and performing
backwashing. The device can be used for
sewage treatment in the
environmental protection field or water purification in the chemical field.