This invention relates to a two-sieve-in-series dehydration method for corn embryo during the production of cornstarch milk, characterizing: before the separated water-bearing embryo enters the squeezing dehydrator, it sequentially passes through the series two stages gravity dehydration sieves for two times of water removing, and then is sent to the squeezing dehydrator for dehydration. By applying this two-sieve-in-series dehydration method, it can decrease the water content of the embryo squeezed out from the squeezing dehydrator by 5%, and the efficiency of the squeezing dehydrator can bedoubled at the same time.