The invention aims to provide a scraping and vibrating welding method for foamed aluminum, which comprises: the foamed aluminum is heated until the temperature is higher than the melting point temperature of a soldering wire or brazing alloy; the soldering wire is respectively stroke on one surface of a foamed aluminum plate A and one surface of a foamed aluminum plate B, so that molten metals are uniformly laid on the surfaces of the foamed aluminum plates; one surface of foamed aluminum plate A and one surface of the foamed aluminum plate B which are provided with the brazing alloy are opposite to each other and clamped on a clamper, and pressure which is perpendicular to the welding surfaces is exerted; and the foamed aluminum plate A and the foamed aluminum plate B are vibrated by means of ultrasonic vibration and simultaneously heated by flame, so that the two foamed aluminum plates are welded together. The scraping and vibrating welding method for the foamed aluminum adopts wirebrushes or steel wires for scraping, makes the brazing alloy capable of fully contacting aluminum parent metals and reacting with the aluminum parent metals, exerts ultrasonic vibration so as to be favorable to remove oxide films on the surfaces of the foamed aluminum in weld zones, cleans away superfluous brazing alloy, can reduce filled brazing alloy, makes the welded seams reach optimum clearance value, reduces the overall weight after welding, gives full play to light weight advantage of the foamed aluminum, and has special significance in the fields of aerospace and so on which are sensitive to weight.