The invention discloses an application of aromatic zinc carboxylate complex catalyst for preparing aliphatic polycarbonate. The catalyst is a salicylaldehyde condensed zinc o-aminobenzoate complex or a substituted salicylaldehyde condensed zinc o-aminobenzoate complex prepared by the reaction of salicylaldehyde (or substituted salicylaldehyde), o-aminobenzoate and zinc acetate (Zn(OAc)2.2H2O). The carbon dioxide and the epoxy cyclohexane are catalyzed by using the catalyst at 60-180 DEG C under the carbon dioxide pressure of 1.0-6.0MPa for copolymerization, and the aliphatic polycarbonate with different molecular weights can be obtained; the alternating copolymerization rate of the carbon dioxide and the epoxy cyclohexane is larger than 95 percent, and the catalytic efficiency reaches 893g polymer/g zinc at maximum.