The invention discloses a power generator used for water communication equipment. The power generator comprises a framework, floating boxes, power generator box bodies, a power generator rotation shaft, a power generation linkage shaft, an impeller rotation shaft and an impeller, wherein the floating boxes are arranged at two sides of the framework, the four power generator box bodies are arrangedin the floating boxes and are connected by the power generator linkage shaft, the power generator linkage shaft is connected with the power generator rotation shaft, and the power generator rotationshaft is connected with the impeller rotation shaft. By the power generator, a surrounding environment is used for hydraulic power generation under the condition that public power cannot be used, andthe power generator is applicable to the situation that the impeller is driven to rotate by water flow, the power generator rotation shaft is driven to rotate and finally the power generator is drivento rotate to generate power by transmission of the power generator linkage shaft under a water flow condition; and the power generator has the advantages of simple structure, high applicability and life convenience and is convenient to carry.