Metallographic specimen electrolytic corrosion system

The utility model provides an electrolytic corrosion system for a metallographic specimen. The electrolytic corrosion system comprises a power supply, a specimen, a cathode plate, a container and a fixing piece, wherein the specimen can be connected with the anode of the power supply through a first lead; the cathode plate can be connected with the cathode of the power supply through a second lead; the cathode plate comprises an electrolysis part matched with the bottom surface of the liquid storage tank and an electric conduction part which is vertically connected with the edge of the electric conduction part and matched with the side wall of the liquid storage tank, and the second wire is connected with the electric conduction part; the fixing piece comprises a first elastic arm which abuts against the inner wall of the container and a second elastic arm which abuts against the outer wall of the container when the fixing piece is used, the first elastic arm and the second elastic arm are connected through a