The invention discloses a power generation device with a function of generating power by the aid of traffic flow. The power generation device comprises an arched lifting structure and a plurality of power generation units. The power generation units comprise driving devices for transmitting mechanical energy, power generation linkage mechanisms and power generator sets, the driving devices comprise main body upper plates, fixing position correcting plates and rebounding devices, a plurality of transmission shafts are arranged on the bottom surface of each main body upper plate at intervals, and free ends of the transmission shafts penetrate the fixing position correcting plates and then are butted into the rebounding devices; the power generation linkage mechanisms comprise spiral guide rails, spiral transmission shafts and gear trains, the built-in spiral guide rails are fixed to the middles of the bottom surfaces of the main body upper plates, and the spiral transmission shafts are rotationally arranged at the bottoms of the spiral guide rails and penetrate the fixing position correcting plates to be connected with the gear trains; the power generator sets are connected with the gear trains, and the gear trains can drive the power generator units to run when the main body upper plates are squeezed. The power generation device has the advantages that the power generation device is unitized, is applicable to roads with different widths and slopes, simple in structure, low in cost and high in power generation capacity and is safe and reliable, and safety factors of the roads can be increased.