| A liquid supply system comprising a base, a liquid storage apparatus, and a pressure supply module. The liquid storage apparatus is positioned on the base and includes multiple liquid tanks for holding liquid. Each liquid tank has an inlet and an outlet for discharging the liquid. The pressure supply module comprises a connection unit and a drive unit. The connection unit includes a connector and multiple first flow valves. The connector has an air inlet and multiple air outlets connected to the air inlet, with each air outlet connected to the inlet of each liquid tank. The first flow valves are respectively installed at the air outlets of the connector. The drive unit is positioned on the base and connected to the air inlet of the connector, and is configured to provide constant-pressure gas to the air inlet of the connector. |