The invention relates to a construction technology for prefabricating a concrete crane beam. The construction technology comprises reinforced bar manufacturing and installing, embedded part installing, molding board installing, concrete casting and concrete curing. A bottom die for prefabricating the concrete crane beam is a concrete pedestal, and machined crane beam reinforced bars are arranged on the pedestal. Embedded parts on the bottom side of the crane beam are placed and fixed on the concrete pedestal before the reinforced bars are installed; the embedded parts on the side faces of the crane beam are firstly fixed at the corresponding positions of a side die by using screws and then are installed in place together with the side die; the side die is a bamboo plywood board; and the side die is fixed by using a screw rod jack and a steel pipe support rack. The concrete is fed in a bin by using a concrete pump truck and is vibrated by a small-diameter plug-type vibrator. After the demolding of the crane beam, the concrete is cured through watering. The construction technology is convenient to construct and operate, the springing of the crane beam can be accurately controlled, the embedded parts are embedded accurately in position, and the prefabricated concrete crane beam is attractive in appearance.