A knot-tying device includes a fix structure, a clamping structure and a transmission component, wherein the clamping structure is disposed in the hole structure and the transmission component is partly disposed between the hole structure and the clamping structure. The transmission component rotates the clamping structure to response to a force, and executes a knot-tying operation.一種打結裝置,包含固定結構、槽夾結構及傳動元件。其中該槽夾結構係配置於該固定結構之中,該傳動元件係部分地設置於該固定結構和該槽夾結構之間,並響應一作用力而轉動該槽夾結構,以執行一打結操作。100...打結裝置110...槽夾結構110a...前段外表面110b...中段外表面110c...後段外表面110d...後端外表面120...傳動元件130...固定結構131...開口132...基部133...臂部133...臂部134...臂部140...夾爪1331...端部1341...端部