Abstract: The present invention concerns a method for electrochemically depolluting an aqueous solution containing at least one heavy metal, said method comprising the following steps: a) a step of measuring the pH of the aqueous solution, optionally followed by a step of adapting said pH by adding a strong acid or a strong base, b) bringing said aqueous solution into contact with a reference electrode, a counter-electrode and a working electrode comprising a conductive substrate, c) applying a constant potential to the arrangement, as a result of which a film of at least one heavy metal oxide is formed on said working electrode, this step being capable of being repeated when the aqueous solution contains several heavy metals, and d) recovering a depolluted aqueous solution and said film.