Abstract: In order to promote the engineering application of electrochemical machining(ECM)in centimeter-scale array structure of thin-walled materials, this paper uses the insulation method to explore the 5×5 array hole structure with a single hole diameter of 0.5 cm. Firstly, based on the traditional ECM, a machining plan for the 5×5 array hole structure was designed; on this basis, the flow field and electric field under each machining scheme are simulated; the simulation shows that the cylindrical array cathode is suitable for the machining of the array hole structure, and when the electrolyte pressure is 0.5 MPa, the processing gap is 0.5 cm, and the voltage reaches 25 V, the metal material can be quickly removed; finally, the feasibility of the array cylindrical mask electrode solution is verified through experiments.