The invention relates to a device, in particular to a sitting posture correction device which comprises a supporting body, a connection rod, a position clamping device, an elastic correction band, a pressure sensor and an alarm. The supporting body is parallel to the back of a person. The sitting posture correction device is characterized in that one end of the connection rod is movably connected with the supporting body and can move up and down along the supporting body, the other end of the connection rod is arc-shaped, the arc-shaped end is movably connected with the position clamping device, one end of the elastic correction band is disposed on the position clamping device, the other end of the elastic correction band is fixed, and the pressure sensor is disposed on the elastic correction band and is connected with the alarm. The sitting posture correction device is easy and convenient to use and does not exert external force on a student. When the sitting posture correction device is used, the student feels comfortable, can realize that a sitting posture is wrong more easily and actively correct the sitting posture. The student can not be interfered by external force and can not be distracted. The sitting posture correction device is mainly used for school teaching and on desks and chairs in offices.