The invention discloses a portable electric climbing ladder for bridge and road building construction. The climbing ladder comprises a first main supporting rod and a second main supporting rod, rotary supporting vertical rods are respectively installed on two sides of the first main supporting rod and second main supporting rod, and the end portions of the supporting vertical rods are connected with fixing end heads; rotary top compressing shafts are rotatably arranged inside the fixing end portions, third rotary shafts respectively drive the rotary top compressing shafts to rotate, and holedrilling rods are respectively slidably arranged inside the rotary top compressing shafts; a tenth rotary shaft is rotatably arranged inside a second supporting cross rod, digging rope rotating wheelsrotating in the second supporting cross rod are respectively arranged on two ends of the tenth rotary shaft, and it is ensured that the digging rope rotating wheels get to the first supporting rod and are perpendicular to the second supporting rod through the supporting vertical rods; rotation of the digging rope rotating wheels can further conveniently help tool transfer for workers, working efficiency is further improved, and troubles caused by hoisting of a crane are avoided.