The invention discloses a method capable of improving the performance of a bonded Neodymium-Iron-Boron magnet. The method comprises the steps of first pretreatment, infiltration treatment, whirl coating treatment, washing treatment, soaking treatment, blow-drying or spin-drying treatment, stoving treatment, secondary pretreatment, electrophoresis treatment or lacquering treatment, levelling the bonded Neodymium-Iron-Boron magnet subjected to the electrophoresis treatment or lacquering treatment under the condition of a temperature of 70 DEG C-90 DEG C for 10-30 min, and then conducting baking under the condition of a temperature of 100 DEG C-200 DEG C for 10-40 min. The method capable of improving the performance of the bonded Neodymium-Iron-Boron magnet has the advantages that sealing flue infiltrates into the inside of the bonded Neodymium-Iron-Boron magnet from holes of the bonded Neodymium-Iron-Boron magnet through an infiltration technology, holes of the bonded Neodymium-Iron-Boron magnet are closed, a protective layer is formed on the bonded Neodymium-Iron-Boron magnet through electrophoresis or lacquering, the bonded Neodymium-Iron-Boron magnet has a strong antiseptic property and solvent resistance, and it is verified through tests that the solvent resistance continues over 30 days, the neutral salt spray test can continue over 24 hours, and the high temperature and humidity (85 DEG C, 85 % RH) resistance continues over 240 hours.