The invention relates to the field of bag lifting devices, and discloses a labor-saving bag lifting device. The bag lifting device includes a front panel and a rear panel, the front panel is equal tothe rear panel in shape and size, the front panel is provided with multiple protrusions, and the top of each protrusion is provided with a sawtooth structure; the rear panel is provided with grooves matched with the front panel, and the depth of the grooves is equal to the height of the protrusions on the front panel. Through mutual cooperation of the two panels, a bag opening is fixed between theprotrusions and the grooves, and the bag can be fixed by pressing the two panels tightly; at that time, the bag can be lifted easily only by lifting handles on the panels, so that the operation is easy, occupied space is small, hands cannot be hurt, and the bag lifting device is convenient to carry and capable of being used repeatedly.