The text, obtained by AFP, called on the Organisation for the Prohibition of Chemical Weapons (OPCW) to report quickly on the findings of its fact-finding mission on the attack that killed at least 58 civilians including children in a rebel-held town in Idlib province.
The measure was circulated to the 15 council members on the eve of an emergency meeting requested by France and Britain to discuss the attack carried out in the early hours yesterday in the town of Khan Sheikhun.
The draft resolution "condemns in the strongest terms the use of chemical weapons" in Syria, in particular the attack on Khan Sheikhun and expresses "outrage" over the use of toxic gases in the six-year war.
It requests that the joint UN-OPCW investigative panel set up to determine who is responsible for chemical attacks in Syria begin work immediately to identify the perpetrators of the latest attack.
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The text calls on Syria to provide flight plans, flight logs and other information on its military operations on the day of the assault.
Syria would also allow UN and OPCW teams to visit air bases from which the attacks involving chemical weapons may have been launched, according to the text.
The draft resolution also threatened to impose measures under chapter 7 of the UN charter, which provides for sanctions.
Britain, France and the United States blame President Bashar al-Assad's forces for the attack, but the Syrian army has denied any involvement.