Biological carbon organic fertilizer and preparation method thereof

The invention discloses a biological carbon organic fertilizer and a preparation method thereof. The biological carbon organic fertilizer comprises, by weight, 32.12%-34.60% of biological carbon, 62.83%-64.12% of organic matter and 2.28%-5.05% of trace elements, and preferably biological carbon produced form flue-cured tobacco stalk. According to the invention, characteristics of the biological carbon prepared from flue-cured tobacco stalk are fully utilized to produce a novel fertilizer with a variety of effects, so as to increase the utilization rate of fertilizer, and improve the absorption and utilization of trace elements by crops. A reasonable and scientific approach for utilization of tobacco stalk is also provided to reduce the environmental pressure of planting area, has good economic benefit, social benefit and ecological benefit, and can enhance the yield and quality of crops.