Abstract: In this paper, taking a kind of spindle electrochemical machining as the object, based on the two-phase flow field with the electric field, temperature field and other physical fields, a multi-physical field coupling model for the spindle pattern ECM is established. Under different inlet pressures, the change trends of the flow rate, temperature, conductivity of the electrolyte, and the bubble rate in the machining gap along the flow direction are explored; and change laws of the forming accuracy and morphology of spindle platform on the anode surface of workpiece are also studied. The simulation results show that when the inlet pressure of the inlet decreases, the flow rate of the electrolyte in the gap also decreases, the processing gap decreases correspondingly with the decrease of electrical conductivity; at the same time, the forming accuracy of the spindle pattern decreases. On the basis of the simulation analysis, the experiment of spindle machining is carried out, and the spindle flange structure is machined on the surface of 304 stainless steel. The experimental results show that the forming accuracy and shape of the spindle are good under the inlet pressure of 0.6 MPa, which is in good agreement with the simulation results.