The utility model provides a concrete crane beam precasting device consisting of a concrete pedestal, a lateral template and a U-shaped bolt fixing bracket, wherein the U-shaped bolt fixing bracket is arranged on the concrete pedestal; the outer side of the lateral template is provided with a vertical back edge; a transverse back edge is arranged in a manner of clinging to the outside surface of the vertical back edge; the lateral template is horizontally fixed by a steel tube rack and a screw rod jack in an opposite supporting manner; the steel tube rack comprises a horizontal support steel tube, a vertical upright at the middle part of the steel tube rack, vertical uprights at the periphery of the steel tube rack and horizontal cross rods of the steel tube rack; and the vertical steel tube rack is connected to the concrete pedestal. By utilizing the concrete crane beam precasting device, construction operation is convenient, the arching of a crane beam can be accurately controlled, the embedding position of an embedded part is accurate, and the precast concrete crane beam is attractive in appearance.