Astronaut Buzz Aldrin -- the second man to walk on the Moon -- was tricked out of making buckets of money off his own name ... according to a new lawsuit he's filed against his stepdaughter.
Buzz filed the suit against Lisa Cannon -- his estranged wife Lois' daughter -- who helped run StarBuzz Enterprises LLC ... which markets and promotes Buzz.
In the suit, Buzz claims Lisa -- acting as his lawyer -- duped him into signing an agreement that gave StarBuzz all rights to Buzz's name, work, and persona.
Further complicating matters -- Lisa and Lois own more than 60% of the company ... and Buzz filed to divorce Lois back in June.
As Buzz puts it in the lawsuit ... Lois and Lisa now own, "Most of what he has acquired since the day he walked on the Moon."
Buzz wants a judge to tear up the agreement.