One-way tidal power station capable of increasing water level difference and continuously generating power and power generation method

The invention discloses a one-way tidal power station capable of increasing water level difference and continuously generating power and a power generation method, and relates to the technical field of tidal energy utilization. The tidal power station comprises an upper reservoir, a lower reservoir and a hydraulic generator set, wherein the lower reservoir is constructed at a bay or a river mouthwith tide and is used for separating the bay or the river mouth from the sea; a pump B is mounted in the lower reservoir, and a water outlet of the pump B is controlled through a gate C; the upper reservoir is constructed on a beach beside the lower reservoir; two water gates are constructed at the upper reservoir; the upper reservoir communicates with the sea through a gate A; a water division pipe is mounted between a gate B and the lower reservoir, so that the upper reservoir communicates with the lower reservoir; and the water division pipe communicates with the upper part of the hydraulicgenerator set, and the lo