The invention relates to a method for preparing nano-structured Zn2SnO4 on stainless steel wires. The method includes steps: adding tin chloride pentahydrate, zinc acetate dihydrate and sodium hydroxide into ethylenediamine and aqueous liquor, dispersing mixture uniformly and placing the mixture into a cleaned stainless steel wire mesh; leading the stainless steel wire mesh to react at the temperature ranging from 170 DEG C to 200 DEG C and taking out the reacted stainless steel wire mesh; and obtaining two nano-structured Zn2SnO4 products with different shapes by means of regulating the proportion of the ethylenediamine to water. The molar ratio of the tin chloride pentahydrate to the zinc acetate dihydrate to the sodium hydroxide is 1:2:6-1:3:4, the proportion of the ethylenediamine to the water is 30:0-0:30, and the reaction time ranges from 12 hours to 24 hours. The method has the advantages that operation is simple, cost is low, the purity of the products is high, and the like. The nano-structured Zn2SnO4 products with the different shapes are more favorable for electronic transmission; and by the aid of a stainless steel base, on the one hand, absorption of a photoelectrode to scattered light and reflected light is improved, on the other hand, adaptability of a photovoltaic cell to transport environments, installation environments and work environments are greatly enhanced.