The invention relates to an organic deoxidant for boiler feed water. The deoxidant is prepared from the following raw materials in percentage by weight: 5 to 30 percent of hydrazide derivative, 2 to 25 percent of organic amine and the balance of water. The molecular formula of the hydrazide derivative is R<1>-CO-NH-R<2>, wherein R<1> and R<2> refer to substituent groups; the R<1> is CH3, CH3(CH2), NH2, NH2-NH, C6H5-NH, COOH, alkyl, naphthenic base, halogeno-group or heteroaryl; and the R<2> is CH3, CH2(CH3), NH2, NH2-NH, C6H5, COOH, alkyl, naphthenic base, halogeno-group or heteroaryl. The organic amine is cyclohexanamine, morpholine, triethanolamine, diethanolamine, monoethanolamine or amine shown as the molecular formula of R<3>-NH2, wherein R<3> is direct chain alkyl with 1 to 20 carbon atoms, branched chain alkyl, naphthenic base or aryl. The invention has the advantages that: the deoxidant is suitable for water supply systems of medium and high-pressure boilers in which primary or secondary demineralized water is taken as feed water; oxygen removing speed is high; and pH regulating agents such as ammonia water and the like are not required to be added additionally.