The invention provides a preparation method of a drought resisting seed soaking agent special for corn. The preparation method has the advantages that firstly, leach liquor is prepared by 'microwave-assisted secondary crushing plus synergistic extraction of double algae active ingredients by an enzymolysis approach plus double bacteria liquid co-fermentation', the leach liquor is rich in bioactive constituents such as mycose, natural organic matters, nitrogen phosphorus and potassium, and active bacteria, acts on seed surface layers, improves the drought stress resistance of corn seeds, directly supplies nutrition and effective biological active bacteria to the corn seeds, and greatly promotes seed germination; secondly, the special drought resisting seed soaking agent has a film forming characteristic, acts on the corn seed surface layers, forms natural biological activity protective films, and protects the seeds from a seeding phase to a sprouting phase, reduces evaporation of water contained in the corn seeds, promotes accelerated division of embryo cells, and enables radicles and germs to smoothly break through seed coats and germinate, and the protective films can be naturally degraded without residues; thirdly, a use method of the special drought resisting seed soaking agent is seed soaking or spraying, safety, environment friendliness, simpleness and high efficiency are realized, and the operation is facilitated.