The utility model discloses a combined type oxidation electrolyte tank body, which comprises a liquid storage tank, a cathode tank, a copper plate anode and a mixing system, wherein the cathode groove is movably arranged on a middle support inside a liquid storage tank body and forms an interlayer structure, together with the liquid storage tank body; the interlayer space is the liquid storage tank; the inner wall of the cathode tank is made of stainless steel while the outer is made of insulating plastic; the copper plate anode is fixed on tank wall of the upper end of the liquid storage tank; the top surface of the sidewall of the cathode tank is a little lower than the top surface of the sidewall of the liquid storage tank; an overflow hole is remained in the top surface of the sidewall of the cathode tank; electrolyte circulating cooling inlet and outlet pipeline holes are communicated with the cathode tank and the liquid storage tank respectively; the electrolyte can be circulated between the cathode tank and the liquid storage tank; an air-blowing and mixing device is arranged at the inner bottom of the cathode tank. The combined type oxidation electrolyte tank body has the characteristics of being low in floor area, small in use amount of the tank liquid, and convenient to lift, clean and wash, and guaranteeing personal safety of electricity use as a protective structure for an anode copper plate is additionally arranged on the tank body, and an anode lead is hidden in the liquid storage tank, and is particularly suitable for surface ceramic processing of a silicon-aluminum alloy piston.