The utility model discloses a plate spring assembly for truck suspension, including last flat spring and lower flat spring, middle backing plate, clamp, rubber pad and grasswort, go up flat spring and install on flat spring down, middle backing plate setting last flat spring under with the root between the flat spring regional, the three is fastened through the centre bolt clamp and is fixed on together, the rubber pad sets up and pass through the clamp chucking between last flat spring flat spring's under with tip, the clamp installs under on the flat spring, can restrict flat spring and the clearance between the flat spring down, it is equipped with the grasswort to go up the flat spring both ends. Compared with the prior art, the utility model, adopt two leaf spring structures, first piece is the spring steel material, utilizes its load that can bear all directions of its isotropic characteristics, has higher reliability, the second piece adopts the combined material leaf spring, utilizes its anisotropic characteristics, only bears vertical force, and the stress is simple, and its quality is less, satisfies light -weighted target.