Center double-cable-plane cable-stayed bridge deck hoisting system and method

The invention provides a center double-cable-plane cable-stayed bridge deck hoisting system comprising a main truss and a bridge floor crane, a track beam is arranged below the bridge floor crane, one end of the main truss is connected with the bridge floor crane, the lower portion of the main truss is connected with a front support through a vertical rod, and the other end of the main truss is connected with the front support through an inclined rod. The bridge floor crane comprises a first section hoisting structure and a cross beam conversion structure which are mutually converted, and the tail width of the first section hoisting structure is larger than that of the cross beam conversion structure. Through mutual cooperation of the upper transverse connection truss, the lower transverse connection truss and the first rear anchoring system, the tail of the bridge floor crane is widened, so that avoidance of hoisting of the first section of the bridge floor crane to a tower column is achieved, and hoisting o