The utility model discloses a small
fire pump which comprises a pump shell, a dynamic
impeller and a
power output shaft are arranged in the pump shell, a pump outer cover is arranged on the front side wall of the pump shell, the circumferential face of the
power output shaft is fixedly connected with the dynamic
impeller, and the rear side wall of the
power output shaft penetrates through the pump shell and is rotationally connected with the pump shell. A static
impeller is arranged on the rear side wall of the pump outer cover, a sealing groove is formed in the rear side wall of the pump outer cover, and the pump shell, the dynamic impeller and the pump outer cover are all formed by
casting aluminum parts in a finish
machining mode. By means of the structure, the
water supply device can adapt to various kinds of power, has the advantages of being small in size, easy to carry, light in weight, low in
oil consumption, low in work, efficient, capable of achieving multiple purposes and multiple matching in one
machine and easy and convenient to install, is lower in economic cost, is suitable for being widely popularized in the fields of
grassland emergency fire fighting
water supply,
mountain forest fire fighting,
agricultural irrigation and the like, and has great market popularization value.