Ventilation grid of bulldozer

The utility model provides a bulldozer ventilation grid which comprises a ventilation grid body arranged on a front hood of a bulldozer, an air suction fan driven by a hydraulic motor is arranged on the side, close to the ventilation grid body, in the front hood, a flow guide cover is arranged on the outer side of the ventilation grid body in a covering mode, and the ventilation grid body comprises a frame and a plurality of flow guide plates arranged at intervals in the vertical direction. The flow guide plate inclines towards the outer side of the front hood from bottom to top, the flow guide hood comprises a main plate and side plates arranged on the two sides of the main plate, the side plates are triangular plates with the small lower portions and the large upper portions, a plurality of air outlet holes are formed in the side plates, a plurality of adjusting holes are formed in the main plate, and the adjusting holes are detachably connected with adjusting plates with holes or adjusting plates without h