The invention relates to the ocean chemical engineering technical field, in particular to a chitosan hyamine and preparation and application thereof. The chitosan hyamine is compound shown by the formula (1), wherein average numeric area of n is 1035-1242. The preparation includes that : 5-chlorin salicylic aldehyde and 4-aminopyridine reflux in absolute alcohol at the temperature of 60-90 DEG C for 4 hours in equal mole ratio, the obtained product is subject to rotation evaporation to remove liquid, the obtained yellow solid is recrystallized by absolute alcohol, dimethylsulfoxide is added tocompletely dissolve the yellow solid, and then acetyl chloride chitosan is added, reaction is carried out at 50-70 DEG C for 16-24 hours, and drying is carried out, thus obtaining low molecular weight chitosan hyamine derivate; wherein the mole ratio of the yellow solid and the low molecular weight chitosan hyamine derivate is 1 : 2. The product of the invention has favourable water-solubility, high substituted ratio and favourable bacteriostactic activity and can be widely applied to the fields of medicine and agriculture.
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