Diaminoguanidine derivatives in preparation of animal growth promoters used in feed. The diaminoguanidine derivatives have a structural formula as shown in formula (I), wherein R1 is methyl, ethyl, isopropyl, n-butyl, n-propyl, n-pentyl, n-octyl, n-tetradecyl, sec-butyl, 3-pentyl, cyclopentyl or benzyl. The diaminoguanidine compounds significantly improve the productivity of ducks if they are fed with the diaminoguanidine compounds. Productivity of pigs or chickens is also improved with such diaminoguanidine compounds.
