The present invention provides a structure for installing bathroom plumbing, the structure comprising: a structural post provided with at least one board installed parallel to the structural post and at least one building floor installed perpendicular to the structural post, the at least one board and the structural post defining a first accommodation space together, the first accommodation space provided with a first discharge pipe, the building floor forming a downward recessed area adjacent to the structural post; at least one detachable floor panel installed at the downward recessed area of the building floor to define a second accommodation space, the second accommodation space communicating with the first accommodation space; at least one toilet disposed on the at least one detachable floor panel.