The invention provides a sitting posture correcting chair. The sitting posture correcting chair comprises a chair body, body fixing cross bars, a body fixing belt, a connecting buckle and the like, specifically, the body fixing cross bars are fixedly mounted at two sides of a backrest of the chair body, the body fixing belt with the connecting buckle is mounted on the body fixing cross bars, when the sitting posture correcting chair is used, the body fixing cross bars pass out from the oxters of a user, the body fixing belt is lifted out, the connecting buckle is buckled, and then the purpose of correcting the sitting posture is achieved (as shown in the figure). The sitting posture correcting chair has the beneficial effects of simple structure and use convenience.