Hidden backrest sofa chair

The utility model discloses a sofa chair with a hidden backrest, which relates to the technical field of sofa chairs and comprises a sofa backrest, a sofa base frame is arranged on one side of the sofa backrest, the sofa backrest is slidably connected with the sofa base frame, a sofa chair seat is slidably connected onto the sofa base frame, a first adjusting connecting rod is rotatably connected onto the side wall of the sofa base frame, and a second adjusting connecting rod is rotatably connected onto the side wall of the sofa base frame. And one end of the adjusting connecting rod I is connected with a rotating roller which is in contact with the sofa chair seat. Through the mutual cooperation of the sofa backrest, the sofa base frame, the sofa chair seat, the adjusting connecting rod I, the rotating roller and the adjusting connecting rod II, after a user sits on the sofa chair seat, the sofa backrest automatically ascends under the driving of the adjusting connecting rod I, the rotating roller and the ad