Abstract: In order to promote the utilization of agricultural waste resources and the application and promotion of biochar in agriculture, this article summarized the types and characteristics of raw materials used for biochar preparation and the influence of preparation processes on biochar characteristics, and analyzed the current production, preparation, application, and risk assessment of biochar.At last, we proposed that in the future, it is necessary to strengthen the standardization of agricultural biochar technology, the relationship between soil characteristics and biochar, and the mechanism of biochar action.