The artwork, named Civilian Drone Strike, depicts drones destroying a child-like drawing of a house while a little girl and her dog watch on in horror.
"Civilian Drone Strike" was on display at the Stop the Arms Fair art exhibition in east London, which ended yesterday (September 15).
Money from the sale of the piece was split between Campaign Against Arms Trade (CAAT), and human rights group Reprieve.
Andrew Smith, of Campaign Against Arms Trade, said: "This money will be used to ensure we mobilise even more people against the next arms fair, so that we can stop it from happening".
He added: "It's time to shut it down for good".
The exhibition was the second half of a two-week festival of protest against the DSEI, the world's biggest arms fair, which brought together delegations from what activists say are some of the worst human rights-abusing regimes with 1,600 makers and sellers of weapons and military equipment.
"Respect for human rights is a mandatory consideration in the process and a country would not be invited where that would contradict the UK's global obligations".