Building elevator lighting device capable of being rapidly installed

The building elevator lighting device comprises an elevator top plate and a lighting lamp body, the lighting lamp body is arranged at the lower end of the elevator top plate, a mounting seat is fixedly connected to the bottom of the elevator top plate, two moving grooves are symmetrically formed in the bottom of the mounting seat, and the two moving grooves are fixedly connected to the bottom of the elevator top plate. The inner wall of the moving groove is fixedly connected with a fixing rod, the inner wall of the moving groove is fixedly connected with a spring corresponding to the fixing rod, and the outer side of the fixing rod is movably connected with a moving plate corresponding to the spring. An illuminating lamp body is placed between two second arc-shaped plates, the second arc-shaped plates move towards the two sides, so that moving plates are driven to move on fixing rods, meanwhile, the moving plates pull springs, under the elastic force effect of the springs, the moving plates are driven to get