The invention relates to a treatment method for heavy-metal-containing wastewater. The treatment method comprises the following steps: 1) adding a heavy metal adsorbent into the heavy-metal-containing wastewater, and fully stirring or shaking for 2-5 hours; carrying out centrifugal separation on the heavy metal adsorbent, or standing, so that supernatant is obtained after the heavy metal adsorbent is precipitated; 2) adding a complexing agent into the supernatant obtained in the step 1), and fully stirring or shaking for 1-3 hours; adding a reducing agent, and fully stirring or shaking for 1-3 hours; regulating the pH value to be 8-12 with an alkaline solution, heating to 60-80 DEG C, fully reacting for 2-3 hours, and carrying out solid-liquid separation; 3) enabling the liquid obtained in the step 2) to pass through activated CD-180 macroporous adsorption resin, enabling effluent liquid to pass through D61 macroporous cation exchange resin, and collecting effluent liquid; and 4) enabling the effluent liquid obtained in the step 3) to pass through a reverse osmosis cellulose acetate membrane at the pressure of 0.5-2MPa, so that the heavy-metal-containing wastewater is treated. The treatment method has the advantages that the content of target heavy metals in wastewater can be obviously reduced, and removal rates reach more than 90% respectively; and meanwhile, the technology is simple, and the operation is convenient, so that the method has good application prospects.