Joseph Auga Matamata, 65, was acquitted on one charge of trafficking.
The jury of five men and six women took seven-and-a-half hours to reach the verdict.
Matamata stood silent in the dock as the verdicts were read out.
His offending related to 13 Samoan nationals that he arranged to bring to New Zealand in small groups between 1994 and April last year.
All of his victims, except three teenagers who were adopted by Matamata in 2016, came to New Zealand on three-month holiday visas. Some ended up staying for years, working long hours for Matamata for no pay.
