The invention discloses a fixed-length bamboo cutting machine for lantern production, which comprises a base, a first work table, a second work table, a cutting device, a first fixing part and a second fixing part. The cutting device comprises a frame, a moving member, a third fixing member, a fixing member, a first driving mechanism, a second driving mechanism, a pressing member and a knife assembly. The first worktable is inclined on the base, the second worktable is horizontally arranged on the base, and the first worktable and the second worktable are connected and arranged; The cutting device is arranged on the first workbench, and the moving part is slidably arranged on the first workbench. The third fixing part is arranged on the moving part, and the third fixing part is provided with a cutting groove; The machine frame is arranged on the movable part, and the fixing frame is arranged on the top of the machine frame. A first driving mechanism and a second driving mechanism are arranged at the bottom of the fixture. The invention only needs one positioning, can obtain the fixed length cutting of the bamboo, does not need repeated measurement, saves labor, is simple in operation and convenient in use.