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As coronavirus fears skyrocket and the stock market plummets ... Soulja Boy's making a whole lot of money off a pretty clean gamble.

Sources close to the rapper-turned-entrepreneur tell TMZ ... he's invested in a company called The Soap Shop -- which, of course, sells soap products and the like. We're told Soulja went in on a franchise location in Mississippi last year with his manager, CEO Miami Mike.

Our sources say Soulja's trying to diversify and heard it was a good investment opportunity. What he didn't know is how well-timed it was.

As you know, the COVID-19 pandemic has people frantically looking for soaps, disinfectant products and anything that'll kill germs. That all adds up to a massive profit for Soulja and co.

Our sources say TSS as a corporation has gone from selling 100 bottles of cleaning products per month to well over 3,000-plus cleaning products in the last 2 months. That's about a 3,000 percent increase, and we're told it's record-setting production.

Soulja and Mike's specific Soap Shop location -- in South Haven, MS -- is seeing similar results. Our sources say profits have tripled without changing anything.

One last thing, the soap venture actually benefits the youth. Soulja has linked his Soap Shop location to a charity called Bubbles for Cash.