The invention relates to a low-carbon dilute-alloy high-strength steel material and the manufacturing method thereof, in particular to a carbide-free bainite corrosion-resisting steel and the manufacturing method thereof, the microscopic structure is of the carbide-free bainite with chemical compositions by the following weight percentages: C: more than or equal to 0.004%and less than or equal to0.05%, Si: 0.01%-1.00%, Mn: 1.70%-5.50%, P: less than or equal to 0.020%, S: less than or equal to 0.010%, Cr: 0.005%-1.0%, Ni: 0.005%-1.0%, Cu: 0.10%-1.50%, and Fe, the rest. The chemical compositions of the invention are relatively simple and are formed by rolling, the technical process of production has easy operation, low cost and high efficiency, which is suitable for the mass production. Owing to the good seawater-corrosion resistance, the low-carbon dilute-alloy high-strength steel material is used for making steel structural projects, such as oceanographic ships, offshore drilling platforms, offshore bridges, etc., thereby prolonging service lives of the projects with remarkable economic and social benefits.