Abstract: A coolant pump for processing machinery includes a housing, a water guide member, and a drive device. The housing includes a chamber, a wind inlet, and a wind outlet. The water guide member includes a hollowed portion, a water inlet, and a water outlet. The drive device includes a transmission shaft, a pumping member, and a blade assembly. The pumping member is mounted in the hollowed portion of the water guide member and to the other end of the transmission shaft. The blade assembly is mounted to the other end of the transmission shaft and located in the chamber of the housing. The coolant pump is highly safe and of long working life because it is powered by the air pressure and it is structurally simple and durable.