The utility model relates to the technical field of crane cranes, and discloses a crane crane with a bottom protection device, which comprises a
cantilever, chutes are arranged on the outer walls of two ends of the
cantilever, a movable frame is arranged at the bottom of the
cantilever, two groups of pulleys distributed at equal intervals are movably connected to two ends of the inner wall of the movable frame, and the bottoms of the pulleys are in sliding fit with the bottoms of the inner walls of the chutes. A
brake box is fixedly connected to the outer wall of one end of the movable frame, a forward and reverse motor is fixedly connected to the top of the inner wall of the
brake box, a rotating shaft at the bottom of the forward and reverse motor is fixedly connected with a lead screw, and a connecting shaft at the bottom of the lead screw is movably connected to the bottom of the inner wall of the
brake box. The problem that braking is delayed or excessive in the prior art is solved, the
operation safety is remarkably improved, meanwhile, the
moving frame moves on the cantilever more smoothly and flexibly, the device adapts to the complex operation environment, the safety of equipment and personnel is guaranteed in an all-around mode, the service life of the equipment is prolonged, and the practical value is high.