Rapid assembling construction system and method for steel beams of overpass business line

The invention discloses an overpass business line steel beam rapid assembly construction system and method, and the system comprises splice plates which are arranged on sections of a steel beam and are used for splicing the sections of the steel beam; the opposite-pulling devices are arranged in pairs, are respectively arranged at the top of the assembled steel beam and the top of the to-be-assembled steel beam, and are used for oppositely pulling the steel beam at the top of the assembled steel beam and the top of the to-be-assembled steel beam; the opposite jacking devices are arranged at the bottoms of the steel beams and used for fixing the bottoms of the steel beam sections; and the deck crane is arranged at the steel beam splicing position and used for hoisting the steel beam to be spliced to the steel beam splicing position. The device has the advantages that the opposite-jacking device is welded to the bottom of the steel beam, the opposite-pulling device is arranged on the top of the steel beam, the