Student chair with adjustable chair back

The utility model provides a student chair with an adjustable chair back. The student chair comprises the chair back, a chair seat and a chair frame, the chair back comprises a fixed chair back and a movable chair back; at least one limiting groove is formed in the fixed chair back; a clamping bulge is arranged at the tail end of the movable chair back; a groove body corresponding to the clamping bulge is formed in the chair seat; when the sliding structure is located at the lowest position of the limiting groove, the clamping protrusion is clamped into the groove body and matched with a locking structure arranged on the back face of the fixed chair back, and the movable chair back is in a locked state. The locking structure is pulled open; the movable chair back moves up and down in the stroke of the limiting groove through a sliding structure; a first rotating piece is arranged on the back surface of the fixed chair back; the chair frame is provided with a second rotating piece, and the chair back can rotat