Preparation of electronic grade gallic acid by complexation-resin adsorption combined process

The invention discloses a technology to make electronic grade gallic acid that includes the following steps: mixing industrial grade gallic acid with EDTA disodium salt according to 100:0.5-100:2, adding deionized water, heating to fully be dissolved, cooling and crystallizing, filtering, washing by deionized water to gain gallic acid crystal; adding ion exchanging resin into chromatography, and aspect ratio is 2-10; heating and dissolving crystal gained in the first step by deionized water, passing through chromatography column at 0.5-3.0BV/h, gathering effluent liquid; gaining electronic grade gallic acid after crystallization and drying. The invention has the advantages of high yield, simple technology, and could be used to take electronic component cleaning.