The invention provides a tooth division type gear tooth surface finish machining method based on a double-peak pulse current electrochemical composite machine, and relates to the technical field of metal gear tooth surface machining. The method comprises the steps of enabling a metal gear to be connected with a positive pole of a pulse power supply, and enabling a negative pole of the pulse power supply to be connected with a cathode conductor; enabling the part between the metal gear and the cathode conductor to be filled with neutral electrolyte; arranging a polishing tool at one side of the metal gear in a floating way; outputting two pulse peak values in every pulse period under the condition that the pulse frequency of the pulse power supply is 5000-7000Hz. The method is high in polishing efficiency and good in polishing effect, the polishing process is not limited by the hardness of the gear tooth surface, and the cost is low.