The invention discloses an alkoxy hetero polymetallic polymer containing rare-earth metal and alkali metal, the molecular formula of which is Ln2(OCH2CH2NMe2)12(OH)2Na8, Ln is rare-earth metal, Me is alkali metal. The polymer in this invention can catalyze the ring-opening polymerization and combined polymerization of the -caprolactone and cyclic carbonates with high activity under temperate condition; the durability of the polymer activity is long, the active chain can catalyze the polymerization of the second monomer and even the third monomer after the polymerization of the first monomer finished; the polymer can also initiate the block copolymerization of two different cyclic lactone as catalyst. |