Abstract: The present invention provides a structure for installing toilet piping comprising: a structural post defining a first accommodation space at a periphery thereof, the first accommodation space being provided with a first discharge pipe; at least one detachable floor panel defining a second accommodation space therebeneath, the second accommodation space communicating with the first accommodation space; at least one toilet disposed on the at least one detachable floor panel; and a second discharge pipe having one end connected to the at least one toilet and the other end connected to the first discharge pipe and disposed in the second accommodation space. The present invention further provides a method for installing toilet piping.