The river-type reservoirs play an important role in intercepting organic carbon(OC), which affects the carbon cycle in inland waters. However, the carbon burial effect of the channel-type reservoir is easily ignored because of its short hydraulic retention time. Limited by the methods of field observations, it remains a challenge to accurately evaluate the carbon sink potential of channel-type reservoirs. The seismic approach can comprehensively reflect the distribution of sediment deposition in reservoirs, which is a fast, economical, and accurate evaluation method of OC burial in reservoirs. In this study, we investigated the organic carbon burial in the channel-type reservoir(Silin Reservoir) in the Wujiang River using seismic surveys, physicochemical data of sediment cores and carbon isotope technique. The results indicated that the sediment thickness of Silin Reservoir varied from 0 to 3.53 m. The irregular underwater topography resulted in a high spatial heterogeneity of the sediment deposition distribution. The OC content, C/N molar ratio and δ¹³C value of sediments in Silin Reservoir ranged from 1.03% to 3.40%, from 4.62 to 9.14, and from -28.5‰ to -23.8‰,with mean values of 1.93%, 7.24 and -26.6‰, respectively. The C/N molar ratio and δ¹³C value of sediments suggested that sedimentary OC were mainly derived from aquatic phytoplankton. δ¹³C values coupled with a two-end-member mixing model showed that the contribution of autochthonous OC to total organic carbon in Silin Reservoir varied from 21.2% to 85.1%, with a mean value of 60.1%. The significantly positive relationship between autochthonous OC and total nitrogen(TN) and between autochthonous OC and total phosphorus(TP) suggested that the input of nutrients promoted the generation of autochthonous OC in the reservoir. The OC burial rate(OCBR) of the Silin Reservoir ranged from 0 to 12133.4 g/(m²·a), with an average of 1429.8 g/(m²·a). The OC burial flux in Silin Reservoir was 2.16×10¹⁰ g/a, which accounted for 0.36‰ of OC burial flux of global reservoirs, indicating that the carbon sink potential of channel-type reservoir cannot be ignored. The autochthonous OC burial flux of Silin Reservoir was 1.30×10¹⁰ g/(m²·a), which was equivalent to 0.32 times the carbon emission from the reservoir surface to the atmosphere as CO₂-C. The OCBR of reservoir from this study and other studies had a logarithmic function with hydraulic retention time, which will help to estimate OCBR from global reservoirs.