A method for treating dangerous liquids for dumping carried out in a plant whose equipment is connected to an electrical panel having an automaton processor, which plant is installed in situ, the method, comprising the following phases: collection of dangerous liquids, mixed or separated, in accumulation tanks, with a volume between 100 and 5,000 litres, made of materials resistant thereto; evaporation, in an evaporator which is filled automatically with the liquids of the accumulation tanks when any of said accumulation tanks reaches an envisaged level by means of a loading pump; and wherein although the evaporation is continuous, the accumulation tanks continue to store dangerous liquids; and wherein the evaporator is equipped with a heating system with a heat pump and operates at a pressure below atmospheric pressure of 5 kPa and at a temperature between 30°C and 34°C; condensing in a condenser which is online, in direct or indirect contact, with the vapour of the evaporator and is actuated with the same, converting said vapour into a distillate; neutralisation of the distillates obtained by means of reagents, in a neutralisation reactor consisting of a rectangular, square or cylindrical receptacle made of polypropylene, stainless steel or polyethylene material with a volume between 100 and 4,500 litres which is filled with the distillate flowing out of the condenser; wherein the neutralisation of the distillate in the neutralisation reactor is carried out at a pH controlled by a pH and conductivity probe, using reagents from corresponding tanks provided for such purpose, a pH+ (alkaline) reagent container and another pH-(acid) reagent container to raise or lower it; and when the product's pH and conductivity value are within a maximum and minimum parameter a disinfectant dosing pump incorporated in a disinfectant tank is started up simultaneously with a discharge pump which expels the waste into a sewer and doses disinfectant therein, through the corresponding pipe after previously passing the waste through an active carbon filter provided behind said discharge pump; and wherein the discharge pump empties the neutralisation reactor in its entirety whereupon the treatment method starts again. collection of dangerous liquids, mixed or separated, in accumulation tanks, with a volume between 100 and 5,000 litres, made of materials resistant thereto; evaporation, in an evaporator which is filled automatically with the liquids of the accumulation tanks when any of said accumulation tanks reaches an envisaged level by means of a loading pump; and wherein although the evaporation is continuous, the accumulation tanks continue to store dangerous liquids; and wherein the evaporator is equipped with a heating system with a heat pump and operates at a pressure below atmospheric pressure of 5 kPa and at a temperature between 30°C and 34°C; condensing in a condenser which is online, in direct or indirect contact, with the vapour of the evaporator and is actuated with the same, converting said vapour into a distillate; neutralisation of the distillates obtained by means of reagents, in a neutralisation reactor consisting of a rectangular, square or cylindrical receptacle made of polypropylene, stainless steel or polyethylene material with a volume between 100 and 4,500 litres which is filled with the distillate flowing out of the condenser; wherein the neutralisation of the distillate in the neutralisation reactor is carried out at a pH controlled by a pH and conductivity probe, using reagents from corresponding tanks provided for such purpose, a pH+ (alkaline) reagent container and another pH-(acid) reagent container to raise or lower it; and when the product's pH and conductivity value are within a maximum and minimum parameter a disinfectant dosing pump incorporated in a disinfectant tank is started up simultaneously with a discharge pump which expels the waste into a sewer and doses disinfectant therein, through the corresponding pipe after previously passing the waste through an active carbon filter provided behind said discharge pump; and wherein the discharge pump empties the neutralisation reactor in its entirety whereupon the treatment method starts again.