The invention provides a method for reducing the electrode vibration amplitude of a tubular electrode during electrolytic machining. The method comprises the following steps: adding an aluminum oxide grinding material into electrolyte used in electrolytic machining, properly adding a dispersing agent, and forming electrolyte suspension liquid of the aluminum oxide grinding material; performing corresponding side surface insulation treatment on the tubular electrode used in electrolytic machining, wherein during machining, electrolyte downwards flows in the tubular electrode and is outwards sprayed from an outlet in the lower end of the tubular electrode. As the damp of the electrolyte added with the aluminum oxide grinding material is higher, the damp to the tubular electrode is increased during vibration, vibration caused by flowing of the electrolyte and insufficient rigidity of the tubular electrode is reduced, and the amplitude is reduced; meanwhile, the aluminum oxide grinding material in the electrolyte flows through an electrolytic machining region along with the electrolyte, and aluminum oxide grinding particles in the grinding material are in contact with the machined surface of a workpiece, so that a grinding effect is achieved, a flow marker on the machined surface of the workpiece is eliminated, and the coarseness on the machined surface of the workpiece and the machining precision are improved.