The utility model provides a filling system. The filling system comprises a liquid storage container, a filling pump and an exhaust valve, the liquid storage container is used for storing filling media, the input end of the filling pump is connected with a bottom outlet of the liquid storage container, and the output end of the filling pump is used for being connected with an oil-gas pipeline andinjecting the filling media in the liquid storage container into the oil-gas pipeline. The exhaust valve is connected with the input end of the filling pump and used for exhausting gas at the input end of the filling pump. According to the filling system provided by the utility model, when a filling medium at the input end of the filling pump generates a vaporization effect under the action of thesuction pressure of the pump, the exhaust valve can be opened to exhaust the gas at the input end of the filling pump out of the pipeline, so that the influence of the vaporization effect on the filling pump can be avoided, and the smooth filling process is ensured.