Sitting posture correcting chair

The utility model discloses a sitting posture correcting chair which comprises a chair frame body, a seat cushion, a push rod, a bearing, a chute guide mechanism, a U-shaped positioning part, a ratchet wheel positioning rod and a waist rest; the seat cushion is arranged on the chair frame body; the push rod penetrates through the chair frame body; one end of the push rod is connected with the seat cushion; the other end of the push rod is arranged on the chute guide mechanism through the bearing; the chute guide mechanism comprises a grooved rod and a rocker arm; the grooved rod is connected with the rocker arm and the grooved rod and the rocker arm are arranged in an included angle; the bearing is arranged on the grooved rod; the U-shaped positioning part can be arranged on the rocker arm movably; one end of the ratchet wheel positioning rod is connected with the U-shaped positioning part; the other end of the ratchet wheel positioning rod is connected with the waist rest. The sitting posture correcting chair provided by the utility model can prevent and solve the problem of bad sitting postures of students, and enables the bad sitting postures of the students to be well corrected unconsciously during the product using process.