Continuous production method of low-carbon steel without mixed casting components

The invention discloses a continuous production method of low-carbon steel without mixed pouring components, and relates to a continuous casting production method of low-carbon steel without mixed pouring components, which comprises the following steps: in the continuous casting process of various low-carbon steel with the carbon equivalent of less than 0.36%, after the pouring of a first steel ladle is finished, when the liquid level height of molten steel in a tundish is reduced to 150-200mm away from the bottom, the molten steel in the tundish is continuously cast; and a large ladle of a second steel grade without mixed pouring components with the first steel grade is cast, the casting blank starts to be marked, the casting stop mark is marked when the weight of the casting blank out of the crystallizer is equal to the weight of the full liquid level of the tundish from the beginning mark, and the marked casting blank of the section is judged to be a packing wire for use. The marking device can be used for