Method for reducing surface cracks of boron containing steel continuous casting sheet billet

The invention discloses a method for reducing surface cracks of a boron containing steel continuous casting sheet billet. Firstly, a boron containing steel component is controlled in an optimized manner, ferroboron is added under the situation that molten steel oxygen removing is good, the boron recycling rate is increased, and the control stability of the boron component is guaranteed; and titanium is utilized for capturing nitrogen needed for forming boron nitride, precipitation of boron nitride particles is restrained, thermoplasticity of boron containing steel is improved, and titanium nitride is high in stability, low in high-temperature solubility, not prone to roughing and capable of refining grains. Furthermore, optimal control is carried out on the continuous casting technology, the secondary cooling area specific water flow, the sheet billet outlet straightening area temperature, the throwing pressure and the front and rear roller smooth arc deviation are controlled, the crack defect ratio of the bo