Resources Minister Matt Canavan banks with Westpac, the company he has labelled "wimps" and encouraged Queenslanders to think about boycotting over its refusal to finance the giant Adani coal mine.

And Finance Minister Mathias Cormann and Prime Minister Malcolm Turnbull, who have both backed Senator Canavan's combative approach to Westpac, are also customers of Australia's second largest bank.

Senator Canavan, who blasted Westpac as spineless for refusing to fund Adani's proposed Carmichael mine in the face of climate change protests, has a Westpac savings account, according to the parliamentary register of interests, along with accounts with Commonwealth Bank, ING and HSBC.

"May I suggest those Queenslanders who are seeking a home loan or a long-term bank deposit or some such in the next few months might want to back a bank that is backing the interests of Queenslanders," he said over the weekend.