Greens Leader Christine Milne says the Palmer United Party has done a mean and tricky deal with the Abbott government to turn down revenue and give a big win to mining magnates around Australia.

"Instead of getting a fair share from the big end of town that can afford to pay, coal mining billionaire Clive Palmer has done a tricky deal and put the pressure back on workers and families," said Senator Milne.

"Champagne corks will be popping in mining company boardrooms while Australian workers will face less money for their retirement.