The invention discloses a detachable environmentally friendly road guardrail. The detachable environmentally friendly road guardrail comprises stand columns, an upper cross beam, a lower cross beam and a plurality supporting columns which are vertically arranged between the upper cross beam and the lower cross beam side by side at intervals. The upper and lower cross beams are arranged in a parallel mode. Two ends of the upper and lower cross beams are fixedly connected with the stand columns. The stand columns are mounted on the ground. Anti-collision sleeves capable of rotating around axes of the supporting columns are arranged outside the supporting columns in a sleeving mode. A plurality of racks extending in the longitudinal direction are arranged on the surfaces of the anti-collisionsleeves. The racks on the anti-collision sleeves arranged outside the adjacent supporting columns in a sleeving mode are engaged with each other. The anti-collision sleeves are arranged to be rubberanti-collision sleeves or silica gel anti-collision sleeves with coarse particles arranged on the surface. Collision kinetic energy of vehicles and the guardrail can be effectively absorbed, the vehicles can be stopped quickly, and loss caused by traffic accidents can be effectively reduced.