Ahmed Moaz al-Khatib said on Tuesday that insurgent groups fighting against the Syrian government are in desperate need of arms, AFP reported.
"We need specialized weapons," he said in Cairo without specifying the nature of the arms.
He also urged the European Union to recognize their group and provide them with financial support.
Khatib was elected as the head of the so-called National Coalition Forces of the Syrian Revolution on Sunday after opposition groups signed an initial unity agreement to form a new leadership against President Bashar al-Assad's government after four days of talks in Doha.
The Arab League and six Persian Gulf Arab states have so far recognized the newly-formed bloc as the Syrian people's legitimate representative. The EU and US have also declared support for the opposition bloc, but fell short of recognizing it.
On Tuesday, French Foreign Minister Laurent Fabius urged world powers to recognize the newly-formed opposition bloc.