Heavy-duty truck chassis

The utility model discloses a heavy-duty truck chassis to solve the above technical problems. The utility model comprises a driver's cab, an engine, a front steel spring I, a front steering bridge I, a front steel spring II, a front steering bridge II, a gearbox, vehicle frame, a driving bridge I, a rear steel spring, a transmission system of driving bridge II, a steering system, a braking system, an electric system, and is also provided with a follow-up steering lifting-able supporting bridge device and a lifting system of the follow-up steering lifting-able supporting bridge arranged at the bottom of the vehicle frame. The utility model improves the loading capacity, satisfies the requirement of the legislated axle load and gross weight, reduces the abrasion of wheels and improves the service life of wheels.