Water supply system of low-capacity external type steam cooler

The invention discloses a water supply system of a low-capacity external type steam cooler. The water supply system comprises the low-capacity external type steam cooler which is arranged at a thermal power plant; the low-capacity external type steam cooler is in tandem connection with a main tube large pore plate and a steam cooler water supply pipeline through inlet and outlet water supply pipelines; a water-side water supply bypass pipeline is arranged between the inlet and outlet water supply pipelines of the external type steam cooler; a bypass small pore plate and a bypass electric gate valve are mounted on the water supply bypass pipeline; the low-capacity external type steam cooler is arranged at a position, far away from a main water supply pipeline, of a steam engine room, and the water supply bypass pipeline supplies water to the low-capacity external type steam cooler. The water supply system has the characteristics of being simple in structure, convenient in use and mounting, capable of ensuring operation safety of the external type steam cooler and capable of improving arrangement position flexibility of the external type steam cooler, so that the investment is reduced, the size of a main plant is reduced, and difficulty of additionally arranging the external type steam cooler by modifying a unit is reduced.