The invention belongs to the field of metallurgical materials, and particularly relates to a steel-steel double-metal rotor and a manufacturing method thereof. A rotor substrate is made by adopting steel or nodular cast iron, a friction reducing layer is made by adopting a self-lubricating wear-resistant steel material, and a final product of the self-lubricating wear-resistant steel material is chemically composed of, by mass, 0.5-1% of C, 11-13% of Cr, 8-10% of Ni, 1.5-2.5% of Mo, 25-30% of Cu, 3-9% of MoS2, 0.5-1.5% of nano alpha-Al2O3 and the balance Fe. The rotor is manufactured by the following method including preparing the self-lubricating wear-resistant steel friction reducing layer material, namely mixing graphite powder, ferrochrome powder, ferromolybdenum powder, nickel carbonyl powder, nano alpha-Al2O3 powder and a binder with iron powder for pressing and sintering; performing copper leaching to obtain the self-lubricating wear-resistant steel friction reducing layer material; spreading the self-lubricating wear-resistant steel friction reducing layer material on a flow distributing face and a plunger hole surface of the rotor respectively, and preparing a friction reducing layer through a diffusion welding process, wherein welding temperature is 1100-1150 DEG C, and welding time is 1-2 hours.