The invention discloses an aluminum alloy silver-plating pre-treatment method including steps of firstly performing heat-treatment to aluminum alloy for removing a stress and then performance surface treatment. In the aluminum alloy silver-plating pre-treatment method, the aluminum alloy is firstly subjected to the heat-treatment for removing the stress and then is subjected to the surface treatment so that a bubbling and peeling phenomenon is maximumly avoided. A first qualification ratio of an aluminium alloy part silver-plating product can reach 89-91%, which is increased by about 5% with comparison of the first qualification ratio of a silver-plating product through a conventional technology. The method greatly increases the qualification ratio of the product, reduces numbers of repaired and scrapped parts, reduces a production cost and increases an economic benefit. A bonding force between a silver plating layer and an aluminum alloy base material is excellent and quality of the aluminium alloy silver-plating product is improved. A micro-hardness of the silver plating layer of the aluminum alloy part is higher than Hv120, which reaches or exceeds a usage requirement of a high-voltage switch, thereby ensuring safe operation of the high-voltage switch.