How long does it take to recover from severe craniocerebral injury, this can not be generalized, can be awakened in about a month, or may face death, mainly depends on whether the craniocerebral injury is timely treatment. Heavy craniocerebral injury, patients show coma, one side of the pupil dilation, light reflex disappeared, brain herniation early, need emergency craniotomy to remove intracerebral hematoma and decompression of bone flap treatment, postoperative use of mannitol to enhance dehydration to reduce intracranial pressure treatment, patients gradually wake up in about 1 month. If the heavy craniocerebral injury is not treated in time, the patient develops to the advanced stage of brain hernia, both pupils are dilated and fixed, the light reflex disappears, and even the vital signs are unstable, even if the craniotomy is performed, the therapeutic effect is very poor, and the patient is often faced with death in a short period of time. Heavy craniocerebral injury, the need for timely access to hospitals, and actively cooperate with the doctor’s treatment, as far as possible to save the patient’s life.