The protest Saturday was the sixth in a row against Vucic's election triumph last weekend. The demonstrators joined hundreds of policemen and soldiers who were holding a separate rally over low wages and poor living standards.
The protests have been held every day since Sunday's election, in which Vucic polled 55 percent of the votes and avoided a runoff election, AP reported.
Government officials claim the demonstrations are organized by opposition leaders. They deny it.
The opposition alleges the vote was marred by irregularities, including muzzling of the media during the campaign, as well as voter intimidation and bribes on Election Day.