Billionaire MP Clive Palmer owns so many companies, properties, cars and aircraft he can't list them all on the official parliamentary register.

The register, tabled in federal parliament on Wednesday, includes an 11-page list of Mr Palmer's interests - the longest of any MP.

Clive Palmer's list of other assets includes vintage cars, boats, paintings, planes and helicopters, albeit with no specific details.

Mr Palmer has declared specific share holdings in 94 private and 11 public companies and reveals he holds director positions at 85 companies in Australia and overseas.