The utility model relates to a multimedium water treatment facilities convenient to wash, it sets up with fixed including jar body the upper cover and the low head at both ends are provided with inlettube and last evacuation pipe about the jar body on the upper cover, are provided with outlet pipe and lower evacuation pipe on the low head, the jar body is formed by a plurality of jars of body segments concatenations, and through the flange seal connection between jar body segment, both sides all are provided with the otter board about jar body segment, and every jar inside packing of body segment has corresponding filtering medium, and filtering medium encapsulates between two upper and lower otter boards of jar body segment. The utility model discloses split into a plurality of jars of body segments with the jar body, the inside cavity of every jar body segment loads corresponding filtering medium, can carry out selective assembly to the jar body as required, makes the dielectric layer of difference make up the range to reach filterable requirement. Through long -time use, can change the dielectric layer of difference to convenient more the washing and regeneration of jar body segment of dismantling.