Abstract: Research achievements of early warning technology of coal and gas outburst were summarized and analyzed in detail from four aspects: early warning theory of coal and gas outburst, acquisition means of early warning information, early warning index and model and early warning software system. The main problems of existing early warning technology of coal and gas outburst were pointed out, for example, timeliness and reliability of part early warning information acquisition needed to be further improved, early models could not realize effective and deep data mining, etc. Development trend of early warning technology of coal and gas outburst was put forward, including development of early warning information monitoring and acquisition technology and equipment with high automation level and precision, research of early warning index and model based on big data, and development of early warning software system based on cloud technology.