Ban made the call as Austrian troops started withdrawing from the UN Disengagement Observer Force (UNDOF) following attacks and abductions of peacekeepers. Croatia and Japan have also withdrawn in recent months.
UN troops monitoring a ceasefire between Syria and Israel traditionally only carry small arms.
Ban called on the UN Security Council to consider measures to beef up the force. "These include, as a matter of priority, enhancing the self-defence capabilities of UNDOF," he said in a report.
Diplomats said better self-defence would mean more armoured cars and body armour and the changes to the mission operations would mean further cutting back on patrols and perhaps closing some observer positions.
Austria, the biggest single contributor to UNDOF, began withdrawing its troops from the force today. About 70 soldiers from the 378-strong Austrian contingent entered Israel to begin their journey home.
