A Queens judge has barred the city’s biggest crane owner from operating his own machinery.

In a decision made public Wednesday, Supreme Court Justice Allan Weiss ruled that construction magnate James Lomma “demonstrated poor moral character” by approving a shoddy repair to a crane that later toppled on the Upper East Side in 2008, killing two workers.

The Department of Buildings had refused to renew Lomma’s hoisting-machine operator and master-rigger licenses after the Kodiak crane collapse killed operator Donald Leo Jr. and construction worker Kurtaj Ramadan.

So Lomma sued last year, after he was cleared of wrongdoing in a criminal trial, to get his licenses back. Lomma’s lawyer did not return a call for comment.