The right-wing leader, 49, has said she is determined to rejuvenate her party, which came second in the presidential elections earlier this year but emerged weakened and divided.
Ms Le Pen timed her speech last weekend to “revitalise” her party at a time when Macron faces his first major protests as thousands of people have marched on the streets of France over the controversial labour reforms.
She wants to steal back the opposition limelight from Jean-Luc Melenchon’s La France Insoumise, which has seized the opportunity to oppose Macron’s proposals of liberalising French labour laws.
It was her first major rally since the Front National’s disappointing results in June’s parliamentary elections.
Speaking to 500 people in the town of Brachay, Ms Le Pen said: “Our political family is the only one capable of embodying a force that could counter the new centrist movement of President Emmanuel Macron.”
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Ms Le Pen said: “We are the exact antithesis of Macronism.”
Ms Le Pen slammed the president for a “policy of perpetual precariousness” because of his labour reforms.
She said: “Macronism is the triumph of the dominant class whose only moral veneer is human rights and whose only values and purpose is money.”
She said she had a “great determination and burning sense of duty not for you, not alone, but with you”.
A senior official in the Front National said Ms Le Pen’s party is ready to drop plans to leave the eurozone following her failed presidential campaign.
Ms Le Pen did admit that the pressure of her presidency campaign had exhausted her and the summer break was “a period of necessary rest, but also observation and reflection”.
The Front National received 34 per cent of the vote against 66 per cent for Macron in the May presidential runoff.
French media has reported that Ms Le Pen is being prepared by her entourage for her candidacy for the 2022 elections.