The invention discloses a technique for degrading gallic acid in wastewater by using Phanerochaete chrysosporium, relating to the field of bioengineering. The technique comprises the following steps: by using Phanerochaete chrysosporium as the initial strain, carrying out liquid shake culture and liquid strain amplification culture, transferring the strain solution into the wastewater containing gallic acid, supplementing certain nutrient substances, and carrying out fermentation culture. By using the technique, the removal rate of the gallic acid can reach 60-100%.