The invention discloses a crash barrier with a high protective capability for traffic. The crash barrier includes an upper guarding rod, a lower guarding rod is arranged below the upper guarding rod,a buffering device is arranged between the upper guarding rod and the lower guarding rod, and the buffering device includes an upper supporting plate and a lower supporting plate; a third groove is formed below the upper supporting plate, a fourth groove is formed above the lower supporting plate, and a rubber ring is clamped between the third groove and the fourth groove; and a water bag is arranged in the rubber ring, a through hole is formed in the upper supporting plate, and a first connecting rod is fixedly connected above the upper supporting plate. The rubber ring and the water bag canperform a good buffering function and can provide good protection during collision of vehicles, under the mutual action of a first draw ring, a second draw ring, a first return spring, a third draw ring, a fourth draw ring and a second return spring, the buffering device can obtain a secondary buffering function to enable the buffering effect to be better, and the protective function for drivers can be improved.