The invention discloses an electrochemical preparation method for copper sulphide films. The electrochemical preparation method for the copper sulphide films comprises the following steps of dissolving inorganic salt containing cupric ions and inorganic salt containing sodium into dimethylsulfoxide or dimethylformamide; adding powdered sulfur in the mixture; heating and stirring the mixture until the powdered sulfur is dissolved so as to obtain electrolyte; performing electrolytic deposition on the electrolyte at the temperature of 70-90 DEG C by using two electrode systems so as to obtain the copper sulphide films with the specific structures on the surface of a conductive substrate. The steps of the method are simple; the cost is low; the copper sulphide films are enlarged easily; and the obtained films have high conductivity in an electrolytic deposition process. The copper sulphide films can directly serve as solar batteries for performing sensitization on dye/quantum dots of the electrodes; the electrocatalytic activity and the stability are high; and the films can be adhered to a substrate firmly and cannot be separated from the substrate easily.