The machine can be used as ordinary double-needle lockstitch sewing machine or single needle lockstitch machine, with a single needle stop device, around the needle can be arbitrarily stopped rising, simple opera tion. Suitable for sewing shirts, uniforms, jeans, coat or similar cloting. Sewing materials adaptability strong, because the needle and the cloth feeding tooth synchronous feeding, can prevent material slid e. Suitable for high quality double stitching and decorating process.