Bajir Singh Tamang, 37, was convicted of luring teenagers from rural areas with the promise of jobs in the Middle East only to sell them to brothels.
His own daughter was among the young women he trafficked.
Correspondents say that the trafficking of women for prostitution has long been a problem for Nepal.
Six women under 16, rescued by human rights groups in 2007 and 2009, had pressed charges against Tamang, prosecutor Krishna Jung Shah told the Agence France-Presse news agency.
“He was charged for illegally recruiting the girls, selling them to Indian brothels and also running a prostitution ring,” Mr Shah told AFP from Sindhupalchok, the central district where Tamang was convicted.
The sentence is the longest handed down in Nepal’s history
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