A wave-shaped guardrail is a removable steel guardrail composed of two wave-shaped steel panels and two posts fixed between them. These posts are securely mounted between the panels. During normal operation of the highway, the guardrail can be easily inserted into pre-set holes at the opening with the help of the telescopic posts, providing isolation and protection. It complements the guardrail on the outside of the highway, maintaining uniformity and aesthetic harmony. In the event of a collision with the vehicle, the wave-shaped steel panels, with their excellent impact resistance and energy-absorbing properties, are not easily damaged and offer excellent protection for the vehicle and its occupants.