Support for One Nation fell by three points in July to 26 per cent, while the coalition's backing rose to 23 per cent, in a Resolve Political Monitor survey released on Sunday night.
Labor remained at 28 per cent, and support for the Greens was also unchanged at 12 per cent.
In the poll of 2252 people, conducted between July 6 and 11 for Nine newspapers, support for Pauline Hanson as preferred prime minister dropped by eight points from 33 per cent in June to 25 per cent.
Anthony Albanese made a comeback as preferred prime minister with 33 per cent nominating him, up from 29 per cent in June, with Angus Taylor sitting on 21 per cent, two points higher than previously.
The survey comes two weeks after Newspoll and Redbridge surveys also showed Senator Hanson's popularity had taken a tumble since her much-discussed National Press Club speech.
Before the address, the One Nation leader had overtaken Mr Albanese as preferred prime minister in a June Resolve poll that had Senator Hanson at 33 per cent over the prime minister's 29 per cent.
Senator Hanson suggested Australia should reject what she described as a failed policy of multiculturalism and instead become a "monoculture" during the speech on June 17.
She also said employees should not be paid to take time off work, even if on maternity leave, which she later argued had been taken out of context.
Earlier on Sunday, One Nation treasury spokesman Barnaby Joyce defended the party's uncosted policies, saying it did not have adequate resources for independent costing.
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