A turnable seat used in a metro passenger compartment mainly and structurally comprises a seat framework, a seat cushion framework, a backrest, a seat cushion, an upper seat cover plate and a lower seat cover plate and is characterized in that the backrest and the seat cushion are made of an integrally transparent mold-pressed glass reinforced plastic material, the backrest and the seat cushion are provided with pit structures and are matched with a sitting posture of the human body in shape, the seat cushion framework is installed on the seat framework, an air spring is arranged between the seat framework and the seat cushion framework and used for controlling flat placement and putaway of the seat. The concave faces with lower middles and high sides of the backrest and the seat cushion of the structure enlarge the fitting area between the seat and the human body, and the comfort level of the seat is higher. The turnable seat is provided with an air supporting structure and can be automatically reset after being used by a passenger. A safety clearance is designed between the backrest and the seat cushion to prevent the passenger from being pinched in the seat cushion turning process. When the turnable seat is not used, the seat cushion is put away and is perpendicular to floor cloth, and large space can be released to facilitate passing and stopping of larger devices such as wheelchairs and baby carriages.