The invention discloses a preparation method of
potassium aurous
cyanide, which adopts the following devices: an
electrolysis bath, a diaphragm tank, an
anode plate and a
cathode plate. The
anode plate is made of a coated
titanium alloy plate and comprises a bottom plate, a lateral plate and an outer plate, wherein the outer plate is fixed with an
anode bar. The diaphragm tank is arranged on the upper end face of the bottom plate of the anode plate. The
cathode plate comprises a plumbing plate, a transverse plate, and an outer plate, wherein the outer plate is fixed with a
cathode bar. The preparation method comprises the following steps: rolling gold into a plurality of flash gold sheets, and then winding and clustering, and then dispersedly placing on the bottom plate of the anode plate around the diaphragm tank; adding a
potassium cyanide solution into an anode chamber, adding a
potassium hydroxide solution into a cathode chamber, heating to 40-65 DEG C and then electrifying and electrolyzing until the current is broken down. A potassium aurous
cyanide solution in the anode chamber after being electrolyzed is post treated to obtain the potassium aurous cyanide. The
mass percent of gold in the product prepared by the invention is more than 68.3 percent; moreover, the device can be massively produced.