The present invention relates to a polyalkylene carbonate resin composition having an interpenetrating crosslinked structure, the composition comprising an aliphatic polycarbonate obtained by reacting carbon dioxide with one or two or more different types of epoxide compounds selected from the group consisting of: halogen or alkoxy substituted or unsubstituted (C2-C10) alkylene oxides; halogen or alkoxy substituted or unsubstituted (C4-C20) cycloalkylene oxides; and halogen, alkoxy, alkyl or aryl substituted or unsubstituted (C8-C20) styrene oxides, as well as one or more compound(s) selected from aliphatic polycarbonate and polyol compounds, epoxy-based compounds and acrylic compounds, and a curing agent able to polymerise, crosslink or react therewith.