The harm of children looking at cell phones is mainly reflected in the long time looking at cell phones, which can easily lead to damage to the visual system, affect the sleep and not conducive to the development of the cervical vertebrae and so on. 1. Damage to the visual system: children are in the stage of growth and development, prolonged viewing of cell phones can easily lead to vision loss, tearing and other symptoms of visual discomfort, interfering with normal visual development. 2. Impact on sleep: children watching cell phones are prone to increased nerve excitability due to the stimulating effect of cell phones on the nervous system, which is not conducive to normal sleep, and children’s sleep quality decreases. 3. Not conducive to the development of the cervical spine: when children look at the cell phone, the cervical spine will be affected by the cervical spine development due to the long time head down, not conducive to children’s health. It is recommended that parents usually do a good job of children’s daily supervision and care, avoid looking at cell phones, develop good habits, and promote normal growth and development.