Fire protection system for steel miter gate of multistage continuous ship lock room

The utility model relates to a fire protection system for a steel miter gate of a multistage continuous ship lock room. The fire protection system mainly comprises main water supply pipes, branch water supply pipes, water curtain nozzles, firefighting water supply valve chambers and alarm valve sets, wherein the main water supply pipes are buried in two side gate walls, the branch water supply pipes are horizontally arranged at the tops of a water receiving surface and a back surface of the miter gate respectively, the water curtain nozzles are arranged on the branch water supply pipes, the main water supply pipes are connected with the branch water supply pipes, the firefighting water supply valve chambers are arranged on the two side gate walls, and the alarm valve sets are arranged in the firefighting water supply valve chambers. As water is supplied to the water curtain nozzles through the main water supply pipes and the branch water supply pipes, a protecting and cooling water curtain can be formed betwe