The subject innovation relates to a tank for treatment for easy installation Joe process consisting in the interior of the tank is made in a simple structure to multi-step process the sewage or raw sewage discharged from homes.; That is, in a tank having a multi-stage split pane treatment tank, form the outer shape of the tank wall 13 and the bottom surface (14) which is located in a split pane point of the upper connection hole tank body 10, 19 is formed the fitted insert to be a groove 17 engaging projection 16 is formed spade portion 15 plate-like partitioning member 20 of the to have a close contact with waste water, characterized in that the treatment tank of a multi-stage (18) configured treatment a treatment tank for.
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