The invention discloses a novel detachable road guardrail, which includes a column, an upper cross beam, a lower cross beam and a plurality of pillars arranged vertically and side by side between theupper cross beam and the lower cross beam, wherein the upper cross beam and the lower cross beam are arranged in parallel, two ends of the upper cross beam and the lower cross beam are fixedly connected with the column, and the column is installed on the ground. An anti-collision sleeve capable of rotating about the axis of the pillar is sleeved on the pillar, a plurality of rack bars extending along the longitudinal direction are arranged on the surface of the anti-collision sleeve, and the rack bars on the anti-collision sleeve sleeved on the adjacent pillar are mutually engaged; The anti-collision sleeve is a rubber anti-collision sleeve or a silica gel anti-collision sleeve with coarse particles arranged on the surface. The invention can effectively absorb the collision kinetic energyof the vehicle and the guardrail, make the vehicle stop quickly, and effectively reduce the loss caused by the traffic accident.