Hanan Ashrawi, an senior member of the Palestine Liberation Organisation, said Nikki Haley was leading a "one- woman crusade ... Against Palestine and the Palestinian people individually and collectively."
"Through an obsessive and targeted campaign of intimidation and threats, Miss Haley's crusade does not miss an opportunity to put pressure on anyone that seeks to challenge Israeli impunity," she added.
Ashrawi said Haley was echoing Israeli Prime Minister Benjamin Netanyahu.
Palestinian officials have privately expressed increasing alarm at the Trump administration's pro-Israel stance as the US president seeks to restart peace negotiations.
Haley visited Israel and the Palestinian territories in June.
Ashrawi said Haley was "compounding the victimisation of the Palestinian people and browbeating the institutions that are meant to defend their rights".
The statement was distributed by the PLO.
Since being nominated by Trump after his November victory, Haley has consistently accused the United Nations of systematic bias against Israel.
The US vetoed the appointment of a former Palestinian prime minister as UN envoy to Libya, while Haley has called on UN Secretary General Antonio Guterres to intervene to block a forthcoming vote on the city of Hebron which declares the West Bank city under threat.
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