The invention discloses a guard bar system of car driving cabin, which comprises a distance detector, a baffle drawing spring, a guard bar, a lifting rod, a electromagnetic inlet-outlet air valve, a piston, a air storage box, and an air compressor. Wherein, the guard bar is mounted at the front of wind shield; the air compressor aerates the air storage box as backup; the air storage box via the electromagnetic valve is connected to the piston cylinder; the piston drives the lifting rod connected to the guard rod; the upper plane of guard rod is in same color and arc degree with the front cover of vehicle. When the distance detector detects barriers in front 100 meters, starting the electromagnetic valve to aerate the piston cylinder; pushing the piston to drive the lifting rod to lift the guard rod in 1s, while the lifting height of guard rod will not baffle the view of driver; if the vehicle head is impacted into the big vehicle, the guard rod can catch the impacting matter to baffle the impact force and protect the driving cabin. The invention can apply the vehicles with lower chassis. |