The invention discloses a medical auxiliary bed, which comprises bed plates for all parts. The bed plates are connected through knuckles and hinges with locking devices; a lower bedspread is arrangedabove each bed plate; a central processing plate, a leakage-proof bag, a water bag and an upper bedspread are packed in each lower bedspread from bottom to top; a water storage bag is arranged under each bed plate; each water bag is connected with each water storage bag through a guide pipe; water pumps are arranged on two ends of the guide pipe; each central processing plate can control the temperature of each water bag, and an angle between each knuckle and each hinge; a hip part bed plate in each bed plate is located in guide rail; two ends of the guide rail are fixed with a bed head and abed tail. The medical auxiliary bed is simple in structure and ingenious in design, and the comfort level of the use of the medical auxiliary bed is effectively improved.