The invention discloses a ventilation opening for a bus. The ventilation opening comprises a sealing layer, filter meshes, a magnet, a ventilation channel, a hinge and a handle, the ventilation channel is connected with a bus roof, and the sealing layer is arranged between a ventilation facility and the bus roof; the handle is arranged on the lower surface of the ventilation channel, and the filter meshes are arranged at two ends of the ventilation channel. The ventilation opening for the bus can purify air in the bus and filter poisonous gas and floating objects in the air, a traditional ventilation opening is greatly improved, and the environment in the bus is improved.