Bridge precast beam hoisting point conversion device and precast beam hoisting method thereof

The invention discloses a bridge precast beam lifting point conversion device which comprises a rigid cross rod, a triangular flange plate, first lifting ropes, second lifting ropes, third lifting ropes and fourth lifting ropes, one side of each of the two ends of the rigid cross rod is connected with one side of one first lifting rope, and the other sides of the two first lifting ropes are connected with the triangular flange plate to form a flexible triangle. The other sides of the two ends of the rigid cross rod are connected with a second lifting rope and a third lifting rope respectively, and the triangular flange plate is further connected with a fourth lifting rope towards the outer side. The rigid cross rod is adopted, so that a certain safe distance is kept between two lifting points of the lifting point conversion device, and mutual interference of steel cables of the crane can be avoided; field assembly is convenient, the weight is light, and transportation is convenient; the workload of site const