The invention discloses a carbide-containing ductile iron and its making method. The carbide-containing ductile iron comprises the following components, by mass, 3.40-3.65% of C, 2.35-2.80% of Si, 2.80-3.15% of Mn, 1.60-1.85% of Cr, 0.04-0.06% of Mg, 0.03-0.05% of K, 0.008-0.016% of Ca, 0.018-0.035% of Ba, 0.03-0.06% of Ti, 0.025-0.050% of V, 0.012-0.018% of N, 0.10% or less of P, 0.02% or less of S, and the balance Fe and inevitable impurities. The carbide-containing ductile iron can be obtained through melting in an electric furnace or a cupola furnace, cast forming and isothermal quenching, and has the advantages of excellent performances, low cost, application popularization, and good effects.