"I dare to repeat that the election of Donald Trump is good news for our country," said Le Pen, who will be the anti-immigration National Front's candidate in France's 2017 presidential election.
In her brief remarks later, she said a Trump White House would assure that the sweeping Transatlantic Trade and Investment Partnership (TTIP) between the US and EU would be rejected.
"More generally, wild globalisation" would be tamed, and she predicted that international relations would improve, "notably with Russia".
Le Pen said Trump would rein in "the warlike interventions that are the source of the huge migratory waves that we are suffering".
If Trump keeps to his pledges, they will be "beneficial for France," she said.
Earlier Le Pen, who heads the anti-immigration National Front (FN), tweeted: "Congratulations to the new president of the United States Donald Trump and to the free American people".
Félicitations au nouveau président des Etats-Unis Donald Trump et au peuple américain, libre ! MLP
— Marine Le Pen (@MLP_officiel) November 9, 2016
One of Le Pen's deputies in the National Front party Florian Philippot tweeted out a picture of Le Pen with the words: Their world is collapsing, ours is being built".
Leur monde s'effondre. Le nôtre se construit. #PlaceAuxPeuples pic.twitter.com/zpRlXqZnlC
— Florian Philippot (@f_philippot) November 9, 2016
Trump's expected victory will give Le Pen the belief she too can upset the apple cart and be elected as president of France next May.
She will be hopeful she can go one step further than Trump's rival Hillary Clinton and become the first female president of her country.
Le Pen is favourite to reach the second round vote, but opinion polls suggest she will be defeated by a right wing candidate, probably Alain Juppé.
Le Pen did not hide her opinions on Clinton during the campaign.
She said Clinton would "destabilise the world" if she wins the White House
"Hillary Clinton is war. Hillary Clinton is devastation," Le Pen told CNN last month.
A Clinton win would mean "geostrategic choices that will lead to world conflicts that threaten to be very heavy," said Le Pen, who is herself vying for the French presidency next year.
"In the interests of France," she said, the White House should go to "anyone but Hillary Clinton".
Le Pen also said Clinton's "economic choices would be destructive to the well-being" of the French people.
Regarding Donald Trump, Le Pen said she and he were "not insiders... will not take orders from such and such a financial power or multi-national interest."
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