The invention discloses a method for preparing high-purity ethyl methyl carbonate through a partition type reactive distillation column. The method comprises the steps that dimethyl carbonate (DMC) and ethyl alcohol are used for preparing the high-purity ethyl methyl carbonate in the partition type reactive distillation column composed of a reaction section, a stripping section, a common strippingsection and a production section. The DMC is fed in two streams, one stream is mixed with the ethyl alcohol to be fed from the bottom of the reaction section of a main tower body T1 of the partitiontype reactive distillation column, and the other stream is fed from the lower portion of the reaction section of the T1. The reaction section is filled with a catalyst, and under the action of a catalyst, the DMC and the ethyl methyl are reacted in the main tower body T1 to generate ethyl methyl carbonate and diethyl carbonate; an accessory tower body T2 of the partition type reactive distillationcolumn is a product refining tower with a condenser but without a reboiler, and the accessory tower body T2 is used for refining the stream from the bottom of the stripping section of the main towerbody T1, and the high-purity ethyl methyl carbonate product is obtained from the top of the T2; the DEC in the tower bottoms of the main tower body T1 is circularly fed into the reaction section of the T1 so as to be used for inhibiting production of DEC, and then the selectivity of the reaction is improved.