The utility model relates to a current -limiting system for dual -fuel engine. This current -limiting system includes first valve, and the flow through its liquid fuel is adjusted for the pressure differential based on on the first valve to this first valve configuration. This current -limiting system still includes the second valve, and the flow through its gaseous fuel is adjusted for the pressure differential based on on the second valve to this second valve configuration. The second valve including setting up the valve body in the valve chamber with removing. The valve body includes from the control drill way of passing its extension. The valve body is still including injecing the recess on its surface. The technical scheme of the utility model can prevent the fuel oversupply of cylinder effectively.