Blac Chyna -- Dark and Stormy Opening ... Rains Cash on New Strip Club (VIDEO)

Blac Chyna swept through the launch of L.A.'s brand new Ace of Diamonds Gentlemen's Club like a hurricane ... raining down stacks of hundos on her former comrades-in-thongs.

Our stripper sources tell us Tyga's baby mama, and ex-stripper ... Blac Chyna got back to her roots Monday night at the club's grand opening and dropped about $10K on the dancers.

We're told BC was paid an appearance fee for poppin' in and rubbin' elbows booties -- so unlike all the guys there ... she probably broke even for the night.

Watch her work and see how it's done, son.

FUN FACT: Blac Chyna got her start on the poles of Miami's King of Diamonds (no relation).