The invention discloses boron-containing high-reaming steel and a production method thereof. The steel comprises the following chemical components of, in percentage by weight, 0.01%-0.05% of C, 0.2%-0.6% of Si, 0.8%-1.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, less than or equal to 0.008% of N, less than 0.001% of Als, less than or equal to 0.0050% of Ca, 0.001%-0.006% of B, 0.007%-0.020% of total oxygen [O]T, Mn/S is large than 250 and the balance Fe and inevitable impurities. According to the steel, microalloy elements such as B are selectively added intothe steel; in a smelting process, the alkalinity of slag, a type and a melting point of an inclusion in steel, a content of free oxygen in molten steel and a content of acid-soluble aluminum Als are controlled; then, double-roller thin strip continuous casting is carried out to cast a cast strip with a thickness of 1.5-3 mm, and the cast strip directly enters a lower closed chamber with a non-oxidizing atmosphere and enters an online rolling mill for hot rolling under the closed condition; and after rolling, strip steel is cooled in a gas atomization cooling mode, and a produced steel coil canbe directly used as a hot rolled plate and can also be used after being subjected to acid pickling and leveling.