The invention discloses a safe fence for construction. The fence comprises a base body and a main body, wherein the base body comprises a plurality of bases, a connecting shaft, a cone body, a fixed block, fixed sleeve bases, fixed pile bodies, a fixed part, locks, movable sleeves, connecting devices, an end cover, a rotating head, a connecting shaft, a first gear, a second gear, a threaded rod, cylinder bodies, a nut base, a movable base, connecting bases, a fence mesh component and connecting parts; the safe fence for the construction has the advantages of reasonable and simple structure and low production cost, and the fence is convenient to install; firstly, the bases are fixed to different positions in the periphery of the construction site through the fixed pile bodies respectively, then the rotating head is rotated by an internal hexagonal wrench, and accordingly the connecting shaft drives the first gear to rotate; the rotation of the first gear drives the threaded rod to rotate through the second gear, the movable base drives the connecting bases to move upward through the rotation of the threaded rod, accordingly it is guaranteed that a first shaft body and a second shaft body can be arranged in the connecting bases and the connecting devices, fence meshes are twisted on the shaft bodies, and accordingly it is convenient to adjust the length of the fence.