The invention discloses a continuous solution polymerization method for rare earth isoprene rubber. The method includes a step of in the presence of a solvent and under a solution polymerization reaction condition, performing a contacting reaction to an isoprene monomer and a rare earth catalyst in at least two in-series reactors, wherein the first reactor is a continuous stirred tank reactor and the other reactors are plug flow reactors. The invention also provides the rare earth isoprene rubber prepared through the method and vulcanized rubber prepared from the rare earth isoprene rubber. The rare earth isoprene rubber prepared through the continuous solution polymerization method has higher cis-1,4 configuration content, higher number-average molecular weight and lower molecular weight distribution coefficient. The plug flow reactors are free of a stirrer and other auxiliary devices, so that the system is more simple in structure, is low in cost, is easy to maintain and reduces cost and energy consumption.