Lifting safety monitoring device for bridge crane

The utility model relates to the technical field of hoisting safety of cranes, in particular to a hoisting safety monitoring device of a bridge crane, which comprises a hoisting seat and a crane car, and further comprises a brake mechanism and two groups of balance mechanisms, each balance mechanism comprises two balance rails, and the balance rails are connected to the bottom end of the hoisting seat; a plurality of groups of balance rollers are mounted on the side wall of the crane car, lifting seats are slidably connected to the balance rails, a lifting electric cylinder is mounted at the bottom end of the hoisting seat and connected with the two lifting seats, extension rails are slidably connected to the bottom ends of the lifting seats, and a connecting mechanism is arranged among the four extension rails; a plurality of multi-angle camera shooting devices are installed on the crane car, the braking mechanism comprises two braking electric cylinders, the braking electric cylinders are installed at the b