The invention relates to a valve stack structure of a water-cooled static frequency converter. The structure includes a circuit connection loop composed of multiple valve stack sets, a water circulation loop and a valve stack press mounting frame, wherein each valve stack set includes a capacitor, a water resistor, a thyristor, radiators and a thyristor control unit, the water circulation loop includes inlet and outlet water pipes, a top of the valve stack press mounting frame is provided with the capacitor and the water resistor, the bottom is provided with the thyristor control unit, the thyristor is arranged between the capacitor and the thyristor control unit, two sides of the thyristor are provided with the radiators, one side of the valve stack press mounting frame is provided with the inlet and outlet water pipes, the radiators have water joints, the water resistor has a water connector, the inlet water pipe is further in communication with the corresponding water joint of eachradiator, each radiator is in communication with the water connector of the corresponding water resistor, and the connector of each water resistor is in communication with the outlet water pipe. The structure is advantaged in that water and power separation is not only achieved, but also maintenance and overhaul are more convenient, and high integration and high safety are achieved.