A cooling system, comprising: a heat exchanger; a converter; a liquid cooling pipeline for connecting the heat exchanger with the converter, wherein the liquid cooling pipeline is provided with a circulation pump; a coolant tank for storing a coolant, wherein the coolant tank comprises a liquid level sensor for detecting a liquid level of the coolant tank; and a control unit for controlling turning-on and turning-off operations of the circulation pump, the cooling system is characterized in that it further comprises: an injection pump connected to the coolant tank, for injecting the coolant from the coolant tank into the liquid cooling pipeline when the injection pump is turned on; wherein the control unit is configured to, control turning-on and turning-off operations of the injection pump, and set a dynamic hydraulic threshold and a static hydraulic threshold corresponding to respective states of the coolant in the liquid cooling pipeline, when the liquid level of the coolant tank reaches an upper liquid level threshold, turn on the injection pump so that the coolant is injected into the liquid cooling pipeline by the injection pump; and when the pressure of the coolant in the liquid cooling pipeline reaches an upper static hydraulic threshold, turn off the injection pump, and execute the turning-on and turning-off operations of the circulation pump with a preset circulation period, wherein the circulation pump forces the coolant to circulate in the liquid cooling pipeline when being turned on. a heat exchanger; a converter; a liquid cooling pipeline for connecting the heat exchanger with the converter, wherein the liquid cooling pipeline is provided with a circulation pump; a coolant tank for storing a coolant, wherein the coolant tank comprises a liquid level sensor for detecting a liquid level of the coolant tank; and a control unit for controlling turning-on and turning-off operations of the circulation pump, the cooling system is characterized in that it further comprises: an injection pump connected to the coolant tank, for injecting the coolant from the coolant tank into the liquid cooling pipeline when the injection pump is turned on; wherein the control unit is configured to, control turning-on and turning-off operations of the injection pump, and set a dynamic hydraulic threshold and a static hydraulic threshold corresponding to respective states of the coolant in the liquid cooling pipeline, when the liquid level of the coolant tank reaches an upper liquid level threshold, turn on the injection pump so that the coolant is injected into the liquid cooling pipeline by the injection pump; and when the pressure of the coolant in the liquid cooling pipeline reaches an upper static hydraulic threshold, turn off the injection pump, and execute the turning-on and turning-off operations of the circulation pump with a preset circulation period, wherein the circulation pump forces the coolant to circulate in the liquid cooling pipeline when being turned on. an injection pump connected to the coolant tank, for injecting the coolant from the coolant tank into the liquid cooling pipeline when the injection pump is turned on; wherein the control unit is configured to, control turning-on and turning-off operations of the injection pump, and set a dynamic hydraulic threshold and a static hydraulic threshold corresponding to respective states of the coolant in the liquid cooling pipeline, when the liquid level of the coolant tank reaches an upper liquid level threshold, turn on the injection pump so that the coolant is injected into the liquid cooling pipeline by the injection pump; and when the pressure of the coolant in the liquid cooling pipeline reaches an upper static hydraulic threshold, turn off the injection pump, and execute the turning-on and turning-off operations of the circulation pump with a preset circulation period, wherein the circulation pump forces the coolant to circulate in the liquid cooling pipeline when being turned on. control turning-on and turning-off operations of the injection pump, and set a dynamic hydraulic threshold and a static hydraulic threshold corresponding to respective states of the coolant in the liquid cooling pipeline, when the liquid level of the coolant tank reaches an upper liquid level threshold, turn on the injection pump so that the coolant is injected into the liquid cooling pipeline by the injection pump; and when the pressure of the coolant in the liquid cooling pipeline reaches an upper static hydraulic threshold, turn off the injection pump, and execute the turning-on and turning-off operations of the circulation pump with a preset circulation period, wherein the circulation pump forces the coolant to circulate in the liquid cooling pipeline when being turned on.