Preparation method of brazing filler metal for aluminum alloy vacuum braze welding and plating solution

The invention discloses a preparation method of a brazing filler metal for aluminum alloy vacuum braze welding and a plating solution. The brazing filler metal for the aluminum alloy vacuum braze welding is prepared by adopting an electro-deposition method, the preparation method of the brazing filler metal for the aluminum alloy vacuum braze welding comprises the following steps: 1) preparing the plating solution; 2) preparing an electrode; 3) implementing electro-deposition process; and 4) baking the brazing filler metal obtained by the electro-deposition method, the brazing filler metal is the brazing filler metal for the aluminum alloy vacuum braze welding. The brazing filler metal prepared by adopting the preparation method of the brazing filler metal for the aluminum alloy vacuum braze welding is directly adhered onto a workpiece to be welded, a soldering lug is not prepared separately during implementing the vacuum braze welding process, the shape of the soldering lug requires no design, welding and cutting are not required, soldering lug assembly is not required either, the cost of the vacuum braze welding is reduced greatly, the welding production time is shortened, and the process of welding production is simplified. The invention further discloses the plating solution applied to the preparation method of the brazing filler metal for the aluminum alloy vacuum braze welding.