A barbecue grill assembly is provided. The barbecue grill assembly comprises a barbecue unit, at least one pedestal, at least one bolt and a plate construction. The pedestal supports said barbecue unit and includes at least one hole. The bolt is disposed corresponding to said hole, and includes at least one body fitted to said hole so as to fasten said bolt. The plate construction includes four leg units pivotally disposed on one face of said plate construction and at least one slot disposed on the side of said plate construction. Wherein said slot is corresponding to said bolt and might be separate from or linked up with said body, so that said plate construction is combinable or detachable to said pedestal. Said leg unit might be received when rotated parallel to said plate construction; said leg unit might be unfolded when rotated perpendicular to said plate construction.