Metallographic film coating device

The utility model utility relates to the technical field of metal detection, in particular to a metallographic film coating device. The metallographic film coating device comprises a shell, wherein the shell is provided with a solution tank and a metallographic sample tank communicated with the solution tank; an anode plate; the anode plate is positioned in the solution tank; a cathode plate; the cathode plate is positioned in the solution tank and is spaced from the anode plate; the clamping assembly can extend into the metallographic sample groove, and the clamping assembly comprises a mounting plate, an abutting plate and a first elastic piece; an accommodating cavity for accommodating a metallographic specimen is formed between the mounting plate and the propping plate; the first elastic piece is used for pushing the abutting plate and/or the mounting plate to adjust the size of the containing cavity. The clamping assembly can stably clamp the metallographic specimen through the mounting plate, the abutti