Abstract: The present invention discloses a hydroelectric generator turbine flow guide structure. The turbine is arranged in a base, and the base includes an inlet port and an outlet port for allowing water to flow into and out of the base, and a flow guide passage for allowing the water to flow; power of the turbine is transmitted to a generator via a power transmission member, the base includes a flow guide base and the turbine arranged on the flow guide base; wherein the flow guide base includes at least one jet nozzle for introducing the water flow to the turbine, and the at least one jet nozzle has a diameter gradually decreasing along a direction from the base toward the turbine. The hydroelectric generator turbine flow guide structure of the present invention takes the most advantage of the water pressure and reduces pressure loss of the flow.