Hydrogen fuel cell cooling liquid filling system and new energy vehicle

The utility model discloses a hydrogen fuel cell cooling liquid filling system and a new energy vehicle, and relates to the technical field of new energy vehicles. The hydrogen fuel cell cooling liquid filling system comprises a cooling liquid container and an expansion water tank, the cooling liquid container is used for containing cooling liquid, a liquid outlet is formed in the cooling liquid container, and the liquid outlet is connected with a liquid outlet pipe. The liquid level sensor in the expansion water tank is used for detecting the liquid level of cooling liquid in the expansion water tank so that maintenance personnel can know the liquid level condition in the expansion water tank in time. A liquid inlet connected with the liquid supplementing pipe is formed in the expansion water tank, a butt joint sensor is arranged on the liquid supplementing pipe or the liquid outlet pipe, and the butt joint sensor can be triggered when the liquid supplementing pipe is connected with the liquid outlet pipe; a