Water cooling plate of water cooling electric reactor

The utility model provides a water cooling plate of a water cooling electric reactor. The water cooling plate comprises a water cooling plate body and one or more than one water flow passage, wherein the water flow passage is arranged in the water cooling plate body, the cross section of the water flow passage is in a Chinese doughnut shape, the water flow passage further comprises one or more than one transverse water flow passage and one or more than one longitudinal water flow passage, the transverse water flow passage and the longitudinal water flow passage respectively penetrate through the whole water cooling plate, and in addition, crossed parts of the transverse water flow passage and the longitudinal water flow passage are mutually communicated. The water cooling plate has the advantages that the heat radiation effect is good, the manufacture is simple, and the cost is low.