Laser warning technologies are important components of optoelectronic countermeasures that detect and warn regarding hazardous laser signals, effectively improving the survival capabilities of crucial platforms such as aircrafts, ships, and satellites. These technologies also hold considerable importance in related fields. Based on their detection principles, these technologies can be categorized into four types: coherent recognition, spectral recognition, grating diffraction, and imaging technologies. This study summarizes the current development status of laser warning technologies and equipment domestically and globally and includes a comparative analysis of the performance and development trends of various laser warning technologies.