The utility model provides a pair of carry reserve charging device's bicycle, it is including the driving license body by oneself, from the adjustable charger of generator, power storage device and voltage, and rear wheel drive produces the electric energy from the generator and carries to power storage device and saved when riding, unanimously can realize charging through the voltage and the required battery charging outfit voltage of the adjustable charger of switching voltage. Can not carry out the problem of charging to cell -phone, digital equipment class electrical apparatus midway whenhaving overcome former bicycle and riding. The utility model has the characteristics of simple structure is compact, rides and can charge convenient operation to cell -phone summation sign indicatingnumber equipment midway.