The utility model relates to an anti-deposition device for adding a molten aluminum titanium wire. The device comprises a molten aluminum launder, a titanium wire guide pipe, a base and a pneumatic anti-deposition mechanism, the molten aluminum launder is located at one corner of the base, the pneumatic anti-deposition mechanism is fixedly installed on the base, one end of the pneumatic anti-deposition mechanism is connected with the titanium wire guide pipe, and one end of the titanium wire guide pipe is in an elbow shape and is correspondingly arranged on the upper portion of the molten aluminum launder. By using the device, the deposition phenomenon of titanium wires in the adding process can be effectively prevented, so that the stability of the titanium content in molten aluminum is ensured, the refining quality of molten aluminum crystal particles is improved, and the beneficial effect of uniform distribution of grain structures of machined aluminum plates is achieved.