Unlike the previous week, no violence erupted between the massive deployment of security forces and the protesters, most of whom are supporters of cleric Moqtada al-Sadr.
"We must keep up the pressure, this is the only way of getting the intended result: ending corruption and giving Iraq back to Iraqis," said Ali Chasseb, a taxi driver who came from the southern town of Amara for the protest.
Sadrist protests have twice led to breaches of the fortified Green Zone, where the country's top institutions are located.
The move is being opposed however by many politicians, including within Abadi's own party, who want to preserve the patronage system that is their main source of power and wealth.