The invention discloses a reversible thumbwheel electricity generating device. The reversible thumbwheel electricity generating device at least comprises an electric generator and a driving shaft connected to the electric generator as well as a reversible thumbwheel assembly connected to the driving shaft; the reversible thumbwheel assembly comprises a hollow rotating shaft and a transmission shaft; one end of the transmission shaft, which is inserted in the hollow rotating shaft, is engaged with a round of teeth corresponding to a gear and formed in an inner cavity of the hollow rotating shaft by the gear; a clutch and a transmission shaft conical gear are arranged on the transmission shaft; and a hollow rotating shaft conical gear opposite to the transmission shaft conical gear and a separation and reunion conical gear for engaging the hollow rotating shaft conical gear and the transmission shaft conical gear are arranged on the outer surface of the hollow rotating shaft. The reversible thumbwheel electricity generating device has the beneficial effects that due to adoption of the clutch, the separation and reunion conical gear and the structures of the transmission shaft and the hollow rotating shaft, the collection and conversion of natural force in different situations can be realized truly, the electric generator is driven to generate electricity, and the structure can be used for hydroelectric generation and wind power generation.