A mobile lift crane includes the following components: a car body which is provided with a movable ground engaging member; a rotating bed which is rotatably connected with the car body so that the rotating bed can swing with respect to the ground engaging members; a boom pivotally mounted to the rotating bed; a first lift reel which is equipped to a first frame connected with the rotating bed; a second lift reel which is equipped to a second frame connected with the rotating bed; and a third lift reel which is equipped to a third frame that is indirectly connected with the rotating bed through being connected with at least one selected from the first lift reel frame and the second lift reel frame. Preferably, the frame which bears the lift reels is connected with the rotating bed through an extracting pin thereby detaching the lift reels and the frame from the rotating bed as the combined unit. Besides, the main crane components (such as mast, mast seat, back connecting device or suspender seat) are indirectly connected with the rotating bed thereby aligning a force along an action line of the main crane components to pass through at least one selected from the reel frames and to be transferred to the rotating bed.