Orthopedic external fixing device and splint fastening assembly

The utility model relates to an orthopedic external fixing device and a splint fastening assembly, the orthopedic external fixing device comprises one or more fastening units used for connecting two enclosed splints, each fastening unit comprises a first connecting seat used for being connected to one splint and provided with a channel, and a second connecting seat used for being connected to the other splint and provided with a channel; the second connecting seat is used for being connected to the other clamping plate; one end of the movable clamping piece is movably connected to the second connecting base through a first elastic limiting piece, and the plane where the lower surface of the other end of the movable clamping piece is located is lower than the plane where the bottom wall of the channel is located. When the other end of the movable clamping piece extends into the channel, the first elastic limiting piece is stressed, and the movable clamping piece rotates by a certain angle; when the other end o