Liberal defector Cory Bernardi's Australian Conservatives party has raised more than $750,000 in funding, primarily through micro-donations from grassroots supporters, in less than six months.

More than 18,500 people have donated to Senator Bernardi's party, with the average donation amounting to $35.

The South Australian senator took the extraordinary step on Tuesday night of revealing the number and value of donations made to his party since he dramatically broke away from the Liberals in February to create his own Australian Conservative movement.

The law requires all parties declare their annual returns to the Australian Electoral Commission by October 20 for public release on February 1, 2018. In Senator Bernardi's case, he is only required to declare the donations made since the date Australian Conservatives was registered as a party, which was April 12.