Air intake and exhausting device for vehicle cab

The invention discloses an air intake and exhausting device for a vehicle cab. The air intake and exhausting device comprises a vehicle body and is characterized in that a fixing frame is arranged on the vehicle body, a ventilating device is arranged on the fixing frame, a switching device is arranged on the vehicle body, and the switching device is connected with the ventilating device; the vehicle body is provided with a forward and reversing rotation control device, and the forward and reversing rotation control device is connected with the ventilating device; the vehicle body is provided with a protective device corresponding to the ventilating device. The air intake and exhausting device is reasonable in design, air exhausting and air intake can be conducted by a fan under the control of a relay, the air volume of air intake and air exhausting is large, and the air environment inside a vehicle is greatly improved; meanwhile, a protective hood can prevent the head of a passenger from being hurt by collision, safety is improved, and the using requirements of modern vehicles are met.