We propose a novel scheme to form a controllable six-well optical trap for cold atoms or molecules by using an optical system of a binary π-phase plate and a lens illuminated by a plane light wave. We calculate the intensity distribution of the six-well optical trap and discuss the evolution process of the optical trap from six-well to double-well or a single-well. The result shows that this six-well trap can be continuously changed into a double-well or single-well one by changed the π-phase plate.