The invention discloses a manufacturing method for a bearing with the Rockwell hardness improved. The method includes the following processes that a steel material is melted in a high-frequency vacuum melting furnace, then casting is conducted, the cooling speed in the casting process is 1.2 DEG C/ min, and an ingot material is formed; the ingot material is maintained for 10 hours at the temperature of 950 DEG C and then is maintained for 90 minutes at the temperature of 500 DEG C; afterwards, a hammer forging machine 500 tons in weight is used for hot forging, and bearing steel is manufactured; and the bearing steel is pressed and formed in the forging machine, and therefore the bearing is manufactured. The steel material comprises, by weight, 0.25%-0.29% of carbon, 0.10%-1.20% of manganese, 0.09%-0.13% of phosphorus, 0.10%-0.19% of sulfur, 0.60%-1.00% of silicon, smaller than or equal to 0.09% of aluminum, smaller than or equal to 0.01% of nitrogen, 0.45%-0.83% of chromium, 0.04%-0.07% of niobium, smaller than or equal to 0.50% of copper, 0.05%-0.60% of nickel, 0.2%-2.00% of molybdenum, 0.2%-0.4% of vanadium, 0.0030%-0.0065% of boron, 0.010%-0.050% of titanium and the balance iron and inevitable impurities. By means of the method, the bearing with the Rockwell hardness improved can be manufactured.