Evander Holyfield -- Child Support Debt Balloons to Over $500,000

Evander Holyfield's massive money problems continue -- TMZ has learned the boxing legend was held in contempt of court for failing to pay more than half a mil in back child support.

As TMZ first reported, the GA. Dept. of Human Services went after Holyfield because he owed $372,097.40 in support for his 18-year-old daughter, Emani Holyfield.

But according to court docs filed recently in Georgia, that amount swelled to $563,900.91. Evander was held in contempt and ordered to immediately fork over $2,950 a month to clear the debt. Holyfield got a big head start by cutting a check for $17,700 ... knocking his debt down to a cool $546,200.91.

But the payment plan is just the beginning ... the judge ordered that a percentage of Holyfield's income be earmarked to pay down the debt.

Calls to Holyfield's rep have not been returned.