During this three-day visit, U.N's Filippo Grandi was shown around a warehouse filled with relief items. Trucks arrived from Pakistan with tents and other supplies for Afghan families, as food and medicine have been scarce.
Even before the Taliban took over last month, Grandi said in written statement, more than 18 million Afghans, or about half the population, required humanitarian aid.
More than 3.5 million Afghans were already displaced in a country that is battling drought and the COVID-19 pandemic.
Poverty and hunger have spiralled since the Taliban takeover, and U.N. Secretary-General Antonio Guterres told an international aid conference this week that Afghans are facing "perhaps their most perilous hour".
Donors at the conference pledged more than $1.1 billion to help Afghanistan.