The invention discloses an embedded adjustable lane guardrail which comprises a steel wire, steel pipe rotating shafts, springs and adjusting shafts. Two guardrail grooves are dug in the position of the double amber lines in the middle of a two-way lane and the position of the partition line of an express lane and a common lane respectively, concrete leveling layers are arranged at the bottoms of the grooves, right-angled-U-shaped steel plates are arranged on the leveling layers, steel bar sliding grooves are formed in the two sides of the right-angled-U shape parts, and guide fixed pulleys are installed in the grooves. The adjusting shafts are arranged on the two sides of a guardrail body, two sets of limiting clamping locks are arranged at the positions, making contact with the steel wire, of the guardrail adjusting shafts, the guardrail body and the right-angled-U-shaped steel plates are connected through the steel pipe rotating shafts in round holes in the bottom end of the guardrail body, spring devices are arranged in the grooves of the right-angled-U-shaped steel plates, the part, at one end of the guardrail body, of the steel wire is connected with an electric system A, and the part, at the other end of the guardrail body, of the steel wire is connected with an electric system B. By means of the embedded adjustable lane guardrail, the number of lanes can be quickly changed according to the traffic flow in different time frames, traffic can be reasonably canalized, vehicles can be guided to smoothly pass in time, and driving safety is ensured.