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The black liquor of bamboo pulp contains a large amount of silicon, which makes it difficult to separate industrial lignin, thus hindering its high-value utilization. Herein, this paper dedicates to exploring the high-value use of silica-containing lignin. Tetraethyl silicate (TEOS) was added to the above silicon-containing lignin for crosslinking with the lignin to prevent disintegration during carbonization and provide an additional source of silica. The carbonization is carried out at 600 °C (LT-6), 900 °C (LT-9) and 1200 °C (LT-12), and the structural evolution of SiO x C y is innovatively analyzed. The results show that LT-9 is dominated by the SiO 3 C structure and has a specific surface area of 269 m 2  g -1 . The specific capacitance of LT-9 and LT-12 as supercapacitors electrodes is 78.6 F g -1 and 74.8 F g -1 at a current density of 1 A g -1 , and remains 95 % and 91.7 % after 10,000 cycles. Moreover, LT-9 has a high yield of 54 %. In this work, silicon-containing lignin is exploratively prepared as a silicon-carbide-derived material. Furthermore, the potential relationship between different SiO x C y molecular structures and electrochemical performance is evaluated, which is instructive for the high-value utilization of black liquor in bamboo pulp., (Copyright © 2022 Elsevier B.V. All rights reserved.)