Supporters of former president Jair Bolsonaro ransacked the National Congress building, the Supreme Court and the presidential palace.
Incumbent president Jair Bolsonaro lost the presidential contest to the leftist government of Luiz Inácio Lula da Silva.
Mr Jinping said that China and Brazil, as major developing countries and important emerging nations, share broad common interests and responsibilities.
Former President Luiz Inácio Lula da Silva has won Brazil’s presidential election, defeating incumbent Jair Bolsonaro.
If Mr Lula wins the second round, he would be Brazil’s first democratic president to enter a third term.
Voting is compulsory in Brazil and more than 156 million people are eligible to vote in today’s presidential election.