The consignment weighs about 50 tons and is worth more than USD100,000, Alireza Aqaei, the IRCS representative in Pakistan said on Saturday.
He added that the relief aid was sent to the people of Jacobabad district in Sindh province, one of the worst hit areas.
The Iranian official said that the consignment includes foodstuff and relief items, adding that the aid batch was sent to Pakistan after an assessment of the basic needs of people in flood-stricken areas.
Hundreds of people have been killed across Pakistan due to weeks of monsoon floods in the country.
An overall five million people have also been affected by the floods in the provinces of Sindh, Balochistan and Punjab.
The worst hit area has been the Sindh province with more than half of the flood-related deaths.
Pakistan has suffered destructive floods over the past two years.
In 2010, the country was hit by the worst floods in its history, which took the lives of nearly 1,800 people and affected about 21 million others.