Hundreds more have been wounded in the raids using the controversial unguided munitions, condemned by rights groups as indiscriminate, the Syrian Observatory for Human Rights said.
The heavy casualty toll has sparked a mass exodus from the worst-hit neighbourhoods in the east of the city, the Britain-based monitoring group added.
The latest series of barrel bomb attacks began on Saturday, with at least 85 people killed in a single day of raids in the eastern part of the city.
The latest raids have accompanied a government ground assault on the eastern outskirts of the city, aimed at building on the army's recent recapture of areas outside Aleppo city.
The gains allowed the reopening the Aleppo international airport, after its closure for more than a year.
And security sources have told Syrian media that troops plan to take three neighbourhoods in east Aleppo and three more in the north in a bid to retake the rebel-held sector of the city in a pincer movement.
Persistent fighting between the jihadist Islamic State of Iraq and the Levant and other rebel groups has left much of Aleppo province unsafe, forcing some fleeing civilians to seek refuge in government-held areas of the city, the Observatory said.
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