Process for producing microelement complex fertilizer

The invention discloses a process for producing a microelement complex fertilizer. The method comprises the following steps of: reacting a chelant (ethylene diamine tetraacetic acid (EDTA) or diethylene triamine pentaacetic acid (DTPA) or a mixture of the EDTA and the DTPA), a metallic element compound and alkali (sodium hydroxide, potassium hydroxide or ammonia water) in a molar ratio of the chelant to the metallic element compound to the alkali of 1.01:1:2 (when the metallic element is a Fe element, the molar ratio is 1.01:1:1) at the temperature of between 50 and 125 DEG C for 20 to 60 minutes to obtain EDTA or DTPA chelating element complex fertilizer solution with required proportion content; and adjusting the pH of a product, filtering and drying to obtain a product. In the process, the product is prepared by a one-step process, the obtained product can be adjusted in a certain range (but cannot go beyond the reach of chelating), and a series of products are obtained to meet the specific requirements of