Sectional-type foldable safe handrail for bridge detection vehicle

The invention discloses a sectional-type foldable safe handrail for a bridge detection vehicle. The sectional-type foldable safe handrail comprises a front handrail, a rear handrail and a drive unit, wherein the front handrail stretches and retreats by virtue of the drive of a connection frame; the rear handrail stretches and retreats by virtue of a drive unit; meanwhile, multi-point hinge is adopted, and a plurality of parallelogram structures are formed; the front handrail and the rear handrail are distributed in an inner-layer and outer-layer stacking shape, and relatively independent and free from interference during use; the handrail rods of the two sections of handrails are always parallel to the upper surfaces of a basic arm and a telescopic arm; the two handrails are arranged at the both sides of the basic arm and the telescopic arm of the bridge detection vehicle in a folding manner after retreating. The sectional-type foldable safe handrail disclosed by the invention is safe and reliable, and capable of ensuring non-clearance protection between the front handrail and the rear handrail during table rotation or the telescoping or luffing actions of the basic arm and the telescopic arm, thus improving the working safety of personnel.