The invention discloses a machining and repairing method for a copper anode plate mold. The machining and repairing method for the copper anode plate mold includes the following steps that after an anode mold is hoisted on a gantry milling machine to be fixed, the gantry milling machine is used form milling the inner plane of the anode mold, and the milling thickness is 5 mm; after plane milling of the anode mold is completed, the gantry milling machine is replaced with a customized milling tool to mill the lug portion position, and the milling thickness is 5 mm;, after the lug portion position milling is completed, a milling tool angle of the milling machine is adjusted, and the plane of the anode mold and a transition slope of the lug portion position of the anode mold are mille; and finally, a polishing machine and an inner circle grinding machine are used for polishing and trimming the inner plane of the anode mold and the position, where the milling tool cannot mill, of the lug position. By means of the method, the repairing quality of the anode plate mold us improved, and a guarantee is provided for improving the casting quality of an anode plate and reducing the using cost of the anode plate mold.