The utility model discloses a headrest used for a critical patient in the intensive care unit (ICU). The headrest used for the critical patient in the ICU can effectively prevent pressure sores and promote wound healing of damaged skin. The headrest comprises a base body, a taper hole is formed in the base body, the large-diameter end of the taper hole is located on the upper surface of the base body, a straight groove is arranged in the upper surface of the base body, one end of the straight groove is communicated with the taper hole, and the other end of the straight groove extends to the side face of the base body. When used, the headrest just needs to be placed under the head of the patient, the head of the patient is just positioned in the taper hole, and the neck of the patient is positioned in the straight groove. Due to the fact that the contact area between the taper hole and the head of the patient is large, the pressure born by the head of the patient is relatively dispersive and the pressure sores do not easily occur. Moreover, the middle of the headrest is empty, and thus the existing positions where the pressure sores or the surfaces of wounds are located can be placed in the hollow position, the pressure sores or the surfaces of wounds can not be stressed, and easily heal. Furthermore, when the patient lies on the side, the ear is located in the hollow position, so that the ear can not be stressed and pressure sores can not occur. The headrest used for the critical patient in the ICU is suitable for popularization and application in the field of medical apparatus and instruments.