The incident was the latest to escalate tensions between the Asian nations over their conflicting claims to parts of the South China Sea, a major sealane and rich fishing ground that is believed to hold vast mineral resources.
"We confirmed there was an airdrop of food to our troops," Defence Department spokesman Peter Paul Galvez said.
He said the airdrop was "via airplane," but did not say when it occurred nor give further details.
The shoal is more than 1,000 kilometres from Hainan island, the closest Chinese landmass, but China claims nearly all of the South China Sea based on what it says are historical records.
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China has long demanded the Philippines pull out the vessel and the marines.
But the Philippines said this week that Chinese coastguard ships blocked two Philippine-flagged civilian vessels on March 9 as they were carrying supplies and personnel to the shoal.
The Philippines said this was the first time there had been such Chinese resistance.
The Philippines issued a diplomatic protest over the incident, but China in response reiterated its position that the shoal was Chinese territory.
The Philippines and China, along with Brunei, Malaysia, Taiwan and Vietnam all claim parts or all of the South China Sea.
The Philippines also last month accused Chinese ships of using a water cannon to drive away Filipino fishermen who were approaching Scarborough Shoal, another South China Sea outcrop.