The invention discloses a production method of a multielement microelement amino acid chelating fertilizer and relates to the manufacturing of fertilizers for agriculture, particularly a preparation method of a common microelement chelating fertilizer for crops. By using sodium polyaspartate as a chelating agent, the microelement chelates and a macroelement fertilizer are combined to produce the fertilizer. The obtained fertilizer is applied to soil and dissolved, and the microelements are driven by the osmotic pressure caused by absorption of the macroelements to be close to the root system, so that the absorption efficiency is remarkably improved; in addition, the different microelement chelates are respectively synthesized in different reaction kettles and controlled by using a flowmeter and added to the fertilizer according to the required proportion, so that the flexibility of the microelement formula is guaranteed to be suitable for different requirements of different crops in different regions. According to the production method disclosed by the invention, different microelement chelates mixed in a buffer tank enter into a compound fertilizer granulating device through an atomizing distributor so as to ensure that the different microelements and the microelements and macroelements are uniformly mixed, so that the fertilizer application effect is guaranteed.