Marc Anthony Child Support Case -- I Make $1.25 Million ... A MONTH!

Marc Anthony may be 110 pounds wet ... but in the money department he's a world champ, because he's just acknowledged he rakes in $1.25 million every single month.

Anthony filed legal docs -- obtained by TMZ -- in his nasty child support fight with ex-wife Dayanara Torres. The former Miss Universe wants her monthly support for their 2 sons upped from $13K a month to $113K a month.

Marc had to disclose his income, and his portfolio is impressive. He says he's worth $20.8 million ... of which $260K is in cash. And none of that is in stocks or bonds.

He says he's paying $18K a month in child support in other relationships ... we're guessing that's for the twins he had with Jennifer Lopez.

Dayanara has bitched in legal docs that she was forced to sell her home and live in a crappy, 1,200 square foot San Fernando Valley apartment while Jennifer Lopez was living high on the hog.

Marc Anthony responded in his own legal docs ... Dayanara is a piss poor money manager because she can afford way better than a hovel since he gives her $28,416 a month in spousal and child support.