The invention discloses a blisk blade profile subtle electrochemical machining electrode and a machining method. The device comprises a left electrode device and a right electrode device, wherein the left electrode device comprises an HSK high-precision hydraulic chuck, a first auxiliary liquid supply module, a blade back working cathode, a lower insulating baffle, an electrode base, a transfer base and an upper insulating baffle; and the right electrode device comprises an HSK high-precision hydraulic chuck, an electrode base, a transfer base, a sealing baffle, a second auxiliary liquid supply module, a main liquid supply module, a blade basin working cathode and an upper insulating baffle. According to the invention, through the vibrating electrochemical machining of the left and right electrodes, the final machine shaping of the blisk blade profile surface is finished, the machining efficiency can be improved by 50% compared with that of the traditional machining method, and allowance-free shaping is realized.