The invention discloses a headrest with a treatment function for internal medicine nursing of old people and a using method, and belongs to the technical field of life. A liquid medicine treatment assembly is embedded in the surface of the protection pillow body, a V-shaped groove is formed in the rear end of the headrest body, a neck adjusting treatment assembly is arranged at the front end of the surface of the headrest body, the back end of the surface of the headrest body is embedded with a treatment medicine area, and the back end of the bottom surface of the headrest body is provided with a head adjusting assembly. According to the invention, volatilizable liquid medicine is added into a liquid medicine cylinder, the liquid medicine is heated and volatilized through an electric heating piece, and the liquid medicine is emitted outwards through a micro fan and a porous air disc, so that a user is helped to improve the sleep condition; elastic cloth is controlled to be more attached to the neck of the user; and in addition, the user can separate the headrest body from the protection pillow body and place the headrest body on an arm-chair, so that mop cloth is laid on the back of the arm-chair, the user can carry the headrest body to use on the arm-chair, and the application range is widened.