The invention relates to a low-temperature curing agent composition for epoxy anticorrosive paint. The low-temperature curing agent composition comprises following components in parts by weight: 50-60 parts of polyamine affixture, 20-30 parts of polyamine mannes alkali, 5-10 parts of fatty amine and 10-20 parts of mixed solvent, wherein the polyamine affixture is prepared by carrying out addition modification on polyamine by using novolac epoxy and monofunctional glycidyl ether containing a benzene ring in a heating manner, the mannes alkali of the polyamine is prepared through reaction of polyamine with a phenol compound with a long carbon chain and 37% formaldehyde solution; a fatty amine is an amine with a structure of (CH3)2N(CH2)nNH2, wherein n is 3-5, and the mixed solvent is a mixture of xylene and n-butyl alcohol which are in a mass ratio of 4:1. The epoxy anticorrosive paint prepared by the low-temperature curing agent composition has excellent low-temperature curing performance, does not turn white or get tacky, and has excellent physical and mechanical properties and anticorrosion performance.