The invention belongs to the field of radioactive waste treatment and discloses CHON-element-containing amide organic compounds which can be applied to uranium [U(VI)]/thorium[Th(IV)] separation, plutonium[Pu(IV)]/uranium[U(VI)] separation, lanthanum[Ln(III)]/actinium[Ac(III)] separation and fission fragment element technetium [Tc(VII)] separation. The amide organic compounds have the advantages that the amide organic compounds are synthesized rapidly, simply and conveniently at multiple steps, target product yields are all 80-99%, and economy and high efficiency are achieved. The amide organic compounds contain symmetric bitriamide groups, comprise symmetric double-tripod structures and control extraction power for Th(IV) and U(VI) by changing lengths of carbon chains of bitriamide; immiscibility of the amide organic compounds with water is enhanced through regulating carbon chains of alkyl groups (R) on amide nitrogen atoms, so that the amide organic compounds are soluble in aromatic, alkyl and halogen-containing solvents, and are applied to a liquid-liquid extraction process; the amide organic compounds can be used for achieving Th(IV)/U(VI) separation under a high-acidity condition without three-phase forming, are capable of achieving Pu(IV)/U(VI) separation under the equal conditions because Th(IV) and Pu(IV) are similar in chemical properties, are also capable of achieving Ln(III)]/Ac(III) separation, and are high in Re(VII) distribution ratio.