The invention relates to a tailing heavy metal pollutant electrokinetic and precipitated combined remediation method and belongs to the technical field of tailing heavy metal remediation environmental protection. According to the method, heavy metal pollutant electrokinetic remediation is conducted in a remediation tank; the middle of the remediation tank is provided with a tailing heavy metal remediation groove; the pH of cathode liquor or anode liquor is maintained to be 6-7 through a replenisher; cathode and anode overflow liquor is collected; alkali liquor is added into the obtained cathode overflow liquor, and the pH is controlled to be 7-8; sulfide is added, the liquor is subjected to stirring, standing and filtering to obtain a purified solution, the purified solution is used as the anode liquor replenisher in the remediation process, and the obtained anode overflow liquor is used as cathode liquor replenisher until electrokinetic remediation is completed; and after electrokinetic remediation is completed, the cathode liquor and the overflow liquor are mixed to obtain a mixed solution, alkali liquor is added into the mixed solution to enable the pH of the mixed solution to be controlled within 7-8, sulfide is added, the solutions is subjected to precipitating, stirring, standing and filtering, and finally the solution becomes the purified solution. Through the method, cathode liquor heavy metal secondary pollutants after electrokinetic remediation can be effectively purified.