The invention provides a method for adhering slag onto an electric furnace for smelting titanium slag. The method comprises the following steps: with a low carbon ratio, adopting furnace burden and coke according to the ratio of 100:10 to form a molten pool quickly, controlling FeO to be more than or equal to 15% in slag, and controlling liquid-level temperature of titanium slag to be more than or equal to 1,720 DEG C; adding coke at the upper part of the molten pool according to 100-200 Kg/batch to enable the electrode to rise for 300-1,000 mm in position, after the electrode drops to the position before the coke is added, adding the coke again, and repeating the operation for 2-3 times; using multipoint charging at the edge of the molten pool in the molten pool section; adding the coke to the position, directly facing to the slag hole and iron notch of the molten pool, according to the ratio, in which, the coke is increased by 3-4% compared with that in the normal ratio, of the furnace burden to coke; adding the coke to other edge adding positions according to the ratio, in which, the coke is increased by 2-3% compared with that in the normal ratio, of the furnace burden to coke, wherein the normal ratio of the furnace burden to coke is 100:12, and the power transmission voltage is less than or equal to 320 V; controlling tapping temperature strictly; shortening refining time of grade adjustment at later stage at a high temperature.