The utility model relates to a multi -functional portable child toilet, including ring ontology and two at least supports, ring ontology has the defection hole who is formed by central opening and surrounds central open -ended and sit the face, supports active connections on the body, body bottom interval arrangement have with support assorted connecting portion, longitudinal arrangement's slot hole is offered in the both sides correspondence of connecting portion, the both sides of support upper end have the pivot that can insert in the corresponding slot hole respectively, and this pivot rotate and location structure through between support and body enables around the slot hole the support selectively keeps vertical state or horizontality. The utility model discloses in, outwards rotate the support to horizontal position, can erect the support and use on adult's toilet bowl, establish a plastic bag at the defection hole endotheca, can regard as the defecation device to use support rotation to vertical position, with the support to internal rotation to horizontal position, be convenient for go out to carry and take in, connection structure between support and the body is simple reasonable, flexible operation, convenient to use.