The invention provides a novel track system spanning a flood prevention door. The novel track system comprises track bed blocks, a flood prevention door frame, sleepers, steel rails and fasteners. Theflood prevention door frame spans the track bed blocks and is provided with a left steel rail groove and a right steel rail groove, the sleepers are arranged on the track bed blocks on both sides ofthe flood prevention door frame, the steel rails pass through the steel rail grooves and are mounted on the sleepers, the fasteners are arranged on the sleepers in pairs, grooves are formed in one side, fastening the flood prevention door frame, of the fasteners, and the sleepers are embedded in the grooves. The fasteners include special fasteners and ordinary fasteners, the special fasteners arearranged on the steel rail grooves, the ordinary fasteners are arranged on the sleepers, and gaps between the special fasteners and the ordinary fasteners are not larger than 700mm. The novel track system spanning the flood prevention door has the advantages that the gaps between the fasteners at the threshold of the flood prevention door meet the operation specifications of a main track, and theinstability of the steel rails and the sparking phenomenon both caused by excessive gaps between the fasteners are effectively avoided.