Having lifted the world title four years ago in China, Silvia Neid's side are bidding for a hat-trick of titles and their impressive form continued as they ran the Netherlands ragged.
Having already beaten North Korea 2-0 and Italy 5-0 in their two previous warm-up matches, Germany have now scored 12 goals without reply, but face former World Cup-holders Norway in their final warm-up match on 16 June.
"We're right where we wanted to be at this time," said Germany coach Neid. "We still need some final precision in our play, but we will be very hungry by the time we start the World Cup in Berlin."
Germany's chief playmaker Fatmire Bajramaj, the most expensive player in women's Bundesliga history, played the first half and looks set to be a star of the world cup. Okoyino da Mbabi also stood out in front of 11,136 spectators at the Aachen stadium and opened the scoring.
Germany open their campaign when they host Canada in Group A at Berlin's Olympic Stadium on Sunday, 26 June.