The invention discloses a treatment method of cyanide-containing electroplating comprehensive wastewater, which comprises the following steps: (1) taking the cyanide-containing electroplating comprehensive wastewater, adding alkaline liquor, regulating pH (potential of hydrogen) to 8.0-12.0, adding cationic PAM (polyacrylamide), standing for precipitation, taking a supernate for analysis to determine the cyanide concentration, (2) adding the alkaline liquor to the supernate to regulate the pH to 10-14, (3) adding a sodium hypochlorite solution, stirring for reaction, standing for precipitation after the reaction, and taking a supernate, (4) adding concentrated sulfuric acid, regulate the pH to 6.5-7.0, (5) adding the sodium hypochlorite solution, stirring for reaction to form reaction liquid, and (6) adding a ferrate solution into the reaction liquid, stirring, standing for reaction, and filtering to obtain treated wastewater. The method solves the problems that a thiocyanogen compound cannot be removed by a two-step alkaline chlorination method and a sodium pyrosulfite air oxidation-sodium hypochlorite combined method, and the water becomes black when sodium hypochlorite is fed excessively during treatment.