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In order to quickly adjust the production process of biochar, keep the consistency of production conditions and reduce the production cost of biochar. In this paper, maize straw and rice husk were used as raw material for biochar preparation under 350–600 oC fully pyrolyzed by fixed bed quartz tube pyrolysis device. The image recognition technology was used to acquire the RGB value of biochar and translated into gray value. The relationship between gray value and pyrolysis temperature, proximate analysis, and calorific value was studied; the result showed that the gray value had a strong linear relationship with carbonization temperature. Moreover, the relationships between gray scale and volatile, fixed carbon met the DoseRespmold; the R2reached nearly 0.999. However, the correlations between gray value and ash and net calorific value were weak. This study provided theoretical support for the rapid detection of biochar and timely feedback of large-scale production conditions of biochar.