Ventilation device at top of elevator

The utility model discloses an elevator top ventilation device, and relates to the technical field of elevators. The lift car ventilation device comprises a lift car, a ventilation filtering assembly is connected to the lift car, the ventilation filtering assembly comprises an installation box, the installation box is detachably connected to the lift car, and a box door is rotationally arranged on one side of the installation box. A motor can be turned on to drive a first connecting rod at the output end to rotate, the first connecting rod drives a first bevel gear to rotate during rotation so as to drive a second bevel gear meshed with the first bevel gear to rotate, the second bevel gear rotates to enable fan blades to rotate through a second connecting rod, and therefore external air is sucked into a cylinder; first filtering is carried out through the dustproof filter screen, second filtering can be carried out when air passes through the filter cylinder, finally the air enters the lift car through the fi