The invention relates to a U-shaped buffering supporting base of a diesel engine of an armoured vehicle. The U-shaped buffering supporting base comprises a main vibration absorber 3, a bottom board 6, an upper U-shaped support 2, a lower U-shaped support 4, a nut 1, lower connection bolts 5, upper connection bolts 7 and fixing bolts 8. The main vibration absorber 3 is fixedly connected with the upper U-shaped support 2 through the nut 1, the main vibration absorber 3 is fixedly connected with the lower U-shaped support 4 through the upper connection bolts 7, the upper U-shaped support 2 is connected with the diesel engine through the fixing bolts 8, and the lower U-shaped support 4 is fixedly connected with the bottom board 6 through the lower connection bolts 5. By the adoption of a buffering structure composed of the main vibration absorber 3, the upper U-shaped support 2 and the lower U-shaped support 4, the resonance peak can be effectively restricted, and the good vibration isolation buffering effect is obtained. The upper U-shaped support 2 is provided with a limiting device, and therefore the oversize amplitude of the diesel engine caused by overload is prevented. By means of the U-shaped buffering supporting base, support positioning is accurate, the buffering function is achieved better, and working reliability of the whole machine is improved.