The invention discloses a microelement seed soaking agent for potatoes, which includes the following components, by weight, 80mg to 120mg of Na2Fe-EDTA (ethylene diamine tetraacetic acid, 15mg to 25mg of MnSO4 7H2O, 0.6mg to 1mg of ZnSO4 7H20, 1mg to 5mg of Na2B4O7 10H2O, 0.01mg to 0.03mg of CuSO4 5H2O, 1mg to 5mg of Na2Mo4O7 2H2O and the balance water. The microelement seed soaking agent is rich in microelements, has effect for accelerating growth of seed potatoes and can improve activity of amylase, increase content of soluble sugar and cane sugar, boost decomposition of amylum and sprouting, growth and thickening of buds and improve budding. Further, the microelement seed soaking agent has the advantages that within 5 to 25 days after sprout of the seedlings, plant height of seedlings is increased and stems thereof are thickened, the content of chlorophyll in the seedlings and sound seedling index are increased, root activity is enhanced, accumulation of dry matters of the overground part and the underground part of the seedlings is accelerated, yield is improved, quality and character of the potatoes are improved.