Four-suction pump

The invention relates to an industrial application pump, in particular to a four-suction pump which can reduce cavitation corrosion, accord with requirements for low lift and high rotation speed and be applied to a liquid conveying system. The four-suction pump comprises an outlet flange and an inlet flange which are used for being connected with pipelines. The four-suction pump is characterized by further comprising a pump body, at least two impellers arranged in the pump body and a pump shaft for supporting the impellers. The impellers are arranged on the pump shaft in parallel and covered by a covering plate. The impellers are single-suction impellers or double-suction impellers, each single-suction impeller is provided with an independent liquid sucking and discharging port, and each double-suction impeller is provided with two independent liquid sucking and discharging ports. By means of the four-suction pump, the problem that the existing industrial circulation water system device with high flow capacity, low lift and high rotation speed is poor in cavitation corrosion condition can be solved, the specific speed of the pump is reduced, the rotation speed of the pump and the rotation speed of a driving motor can be increased, and accordingly, cost and waste are reduced.