Suspension bridge with high torsional rigidity

The invention discloses a suspension bridge with high torsional rigidity. The suspension bridge comprises a main beam, a cable bent tower, a main cable and suspension rods, wherein the main cable is arranged on a longitudinal central elevation of the main beam, the suspension rods are arranged on two transverse sides of the main beam and used for suspending the main beam by virtue of the main cable, so that the main cable, the suspension rods and the main beam form a structure with the cross section in a space triangular shape; by utilizing the stability of the triangle, a box-beam structure like the triangle is formed, the overall torsional rigidity and torsional vibration frequency of the suspension bridge can be fundamentally improved, the critical wind speed for torsional instability under the calm wind can be directly improved, the ratio of the torsional vibration frequency and the vertical vibration frequency also can be increased, the critical wind speed of the vibration can be increased, and the safety of the large-span suspension bridge can be guaranteed; moreover, materials and cost of the existing suspension bridge are not increased, the cross section can be increased only by adopting one main cable, the number and cross section of the suspension rods can be increased, and the torsional rigidity can be further improved.