Cooling system of liquid cooling server

The utility model is suitable for the technical field of heat dissipation of liquid cooling servers, and discloses a cooling system of a liquid cooling server. The liquid cooling server cooling system comprises a heat exchanger, a water tank, at least one liquid cooling server and a ventilation pipeline. A first liquid inlet of the water tank is connected with a pipeline for feeding liquid, and a first liquid outlet is connected with the heat exchanger through a pipeline; a second liquid inlet of the liquid cooling server is connected with the heat exchanger through a pipeline, a second liquid outlet of the liquid cooling server is communicated with the water tank through a pipeline, and a first check valve is arranged on the pipeline between the second liquid inlet and the heat exchanger; one end of the ventilation pipeline is used for being connected with an air pump, the other end of the ventilation pipeline is communicated with a pipeline between the first check valve and the second liquid inlet, the air