Lasers have a wide range of applications, including applications in industry, medical care, scientific research, information technology and military, etc. Nevertheless, laser induced potential damages to human bodies must raise concerns. They mainly damage human eyes and skin. In extreme cases, they can cause permanent damages. After introducing the classification of lasers, this article summarizes the safety standards and damage thresholds of lasers based on domestic and foreign literatures in the past years, as well as the diagnosis, protection, and treatment of laser injuries to the human body. The aim is to provide assistance to relevant scientists in preventing and treating human laser injuries.