The invention discloses a hand-operated newborn body posture adjusting device. The device comprises a supporting pad, one end of the supporting pad tightly adheres to a backrest, a flexible connectingbelt is arranged between the backrest and the supporting pad, and a handle is arranged at the end, away from the backrest, of the supporting pad; a plurality of telescopic mechanisms are arranged atthe bottom of the supporting pad, and supporting bases are tightly welded at the bottoms of the telescopic mechanisms; a locking handle is arranged on one side of each telescopic mechanism; one end ofthe handle penetrates through the outer wall of the supporting pad and is tightly welded with a rotating shaft, and a first bevel gear is tightly welded to the end, away from the handle, of the rotating shaft; a second bevel gear is arranged on one side of the first bevel gear, a rotating rod is tightly welded to one end of the second bevel gear, and a connecting rod is tightly welded to the outer wall of the rotating rod. The device is simple in structure and convenient to use, the backrest can cushion the back of a newborn, the angle can be adjusted, meanwhile, the device is controlled to ascend and descend conveniently through the telescopic mechanisms at the bottom, and the body posture can be conveniently adjusted.