A luggage cart is disclosed, which comprises a supplementary support device equipped with a roller and pivoted to the back side of the cart body of the luggage cart and turnable relative to the cart body between a first position where the supplementary support device is closely attached to the back side of the cart body, and a second position where the supplementary support device works with the wheels at the back side of the cart body to support the luggage cart stably on the floor in a tilted position.