Children’s involuntary crooked mouth is considered to be related to imitation of others, encephalitis, idiopathic facial nerve palsy, pediatric Tourette’s syndrome and so on. 1. Imitation of others: For some children, unconscious crookedness may occur due to imitation of other people’s actions. Since it is a bad habit, parents should pay attention to timely correction. 2. Encephalitis: the disease is related to viral, bacterial and other pathogenic infections, and autoimmune system disorders. Typical symptoms include fever, nausea and vomiting, headache, impaired consciousness, paroxysmal twitching of the facial muscles, etc., which can also be manifested as unconscious crooked mouth. 3. Idiopathic facial nerve palsy: the cause of the disease is not yet clear, and it may be related to neuroleptic virus infection. The disease may cause peripheral facial paralysis, abnormal sense of taste, abnormal sense of hearing and other symptoms, and may also be manifested as involuntary crooked mouth. 4. Pediatric Tourette Syndrome: the cause of the disease is not yet clear, and it is considered to be related to genetics, neurophysiological factors, environmental factors and so on. Patients mainly manifested as motor tics or vocal tics, but also appeared mood swings, repetitive behaviors, etc., can also be manifested as involuntary speech crooked mouth. Parents are advised to bring their children with involuntary speech distortion to the doctor for examination, so that the disease can be clarified and treated according to the doctor’s instructions.