Australia agreed with the EU in March after eight years of negotiations on the trade deal, which is yet to be ratified by parliament.
Aussie shoppers will get access to cheaper European food, wine, cars and clothes under the deal, but domestic meat farmers and steelmakers say they've been dudded in the negotiations.
Nationals leader Matt Canavan said the coalition would oppose the accord in parliament.
After days of confusion over the opposition's official position, Liberal treasury spokesman Tim Wilson on Monday confirmed the coalition was against it.
"We haven't seen the legislation, it hasn't gone to the parliament yet, but we're certainly opposed to it while going through the parliamentary and coalition processes," he told ABC TV on Monday.
"The trade minister, frankly, has made a complete hash of the negotiations - his job is to advance Australia's national interest, and we want him to do that."
Trade Minister Don Farrell on Monday urged the Liberals not to let themselves get beaten around by the coalition's junior partner.
"What we're saying to (Opposition Leader Angus Taylor) is stand up to Mr Canavan on this occasion because to defeat a new free trade agreement with the Europeans would be an act of economic self harm," he told ABC Radio.
"Don't support Senator Canavan in going off an economic cliff."
Under the deal, Australia would remove a five per cent tariff on imports of European products, which hits car makers such as BMW and Mercedes, along with goods such as fashion products, food and drinks.
EU tariffs would in turn be removed on a wide range of imported Australian goods, including critical minerals, manufactured items and many dairy products.
However, farmers were left angered, with some saying it would deliver Australians no commercially meaningful market access compared to generously subsidised European primary producers.
"The gaslighting continues," Senator Canavan said on Monday.
"The farm sector has always been a supporter of free trade, but it shows the weakness of this deal."
Australia will be able to sell 35,000 tonnes of beef to the EU tariff-free under the agreement, but Senator Canavan bristled at an enduring 50 per cent levy on Australian steel heading to the bloc.
Mr Wilson urged Labor to walk away from the deal if it wasn't up to scratch despite the years of negotiating effort.
"You don't want to sell out the country and do a bad deal, you want to sign a better alternative or no deal at all," he said.
The horse-trading was described as "hard yakka" by European Commission President Ursula von der Leyen on her visit to Canberra in March.
Mr Farrell on Monday paraded the deal's offerings for Australia's $1.5 billion-a-year seafood industry and critical minerals business, which he said could make the agreement worth $30 billion.
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