A wind-tunnel type power generator includes an outer cover, a turbine rotor, an air escape valve, and at least a rear fin. The outer cover is a convergent-divergent shape and the turbine rotor is installed into an inner flowing path thereof, the air escape valve is installed on the outer cover and the rear fin is installed on the surface of the outer cover. The acceleration of the outer cover, the higher efficiency of the turbine rotor, and the reducing pressure of the air escape valve is to gain the wider operation area, smaller space, lower weight, lower noise, and higher efficiency of the wind-tunnel type power generator.
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