Bridge floor drainage system and bridge

The utility model discloses a bridge floor drainage system and a bridge, and relates to the technical field of bridge construction, the device comprises at least one vertical drainage pipe, and a gas expansion valve is arranged in each vertical drainage pipe; the gas conveying assembly is arranged on the bridge surface of the main bridge, and the gas conveying assembly is connected with all the vertical drainage pipes and controls the gas expansion valve to be switched off or switched on; and the pipeline equipment is connected with all the vertical drainage pipes, and is configured as follows: when the gas expansion valve is cut off, the pipeline equipment is communicated with the water collecting hole in the main body bridge and the emergency drainage collecting device, and when the gas expansion valve is communicated, the pipeline equipment is cut off from the emergency drainage collecting device. The automatic opening of the expansion valve is controlled in a gas driving mode, the valve and main pipelines