A double-tape banknote temporary storage device, comprising: a banknote temporary storage reel configured to wind a pair of tapes with banknotes stored between the pair of tapes; a pair of tape withdrawing reel assemblies being a first tape withdrawing reel assembly and a second tape withdrawing reel assembly having the same structure, wherein the first tape withdrawing reel assembly and the second tape withdrawing reel assembly are located respectively at two sides of the banknote temporary storage reel and are each configured to wind an individual tape after the banknotes are released; the pair of tapes, wherein two ends of the pair of tapes are aligned with each other and fixed onto the banknote temporary storage reel, and another two ends of the pair of tapes are fixed respectively onto the first tape withdrawing reel assembly and the second tape withdrawing reel assembly; a pair of tape pressing wheels, located between the banknote temporary storage reel and respective tape withdrawing reels, for pressing the two ends, close to the banknote temporary storage reel, of the pair of tapes to approach each other and forming a double-tape conveying passage; characterized in that, the double-tape banknote temporary storage device further comprises a planetary gear decelerating motor and a synchronous gear transmission system, and a driving gear is provided on an output shaft of the planetary gear decelerating motor, and the synchronous gear transmission system is configured to transmit power of the planetary gear decelerating motor to both of the banknote temporary storage reel and the pair of tape withdrawing reel assemblies simultaneously, wherein the synchronous gear transmission system comprises a first gear configured to drive the banknote temporary storage reel, a first transmission gear set engaged with the driving gear and transmitting power to both of the banknote temporary storage reel and the first tape withdrawing reel assembly simultaneously, and a second transmission gear set connecting the first gear and the second tape withdrawing reel assembly and transmitting power to the second tape withdrawing reel assembly. a banknote temporary storage reel configured to wind a pair of tapes with banknotes stored between the pair of tapes; a pair of tape withdrawing reel assemblies being a first tape withdrawing reel assembly and a second tape withdrawing reel assembly having the same structure, wherein the first tape withdrawing reel assembly and the second tape withdrawing reel assembly are located respectively at two sides of the banknote temporary storage reel and are each configured to wind an individual tape after the banknotes are released; the pair of tapes, wherein two ends of the pair of tapes are aligned with each other and fixed onto the banknote temporary storage reel, and another two ends of the pair of tapes are fixed respectively onto the first tape withdrawing reel assembly and the second tape withdrawing reel assembly; a pair of tape pressing wheels, located between the banknote temporary storage reel and respective tape withdrawing reels, for pressing the two ends, close to the banknote temporary storage reel, of the pair of tapes to approach each other and forming a double-tape conveying passage; characterized in that, the double-tape banknote temporary storage device further comprises a planetary gear decelerating motor and a synchronous gear transmission system, and a driving gear is provided on an output shaft of the planetary gear decelerating motor, and the synchronous gear transmission system is configured to transmit power of the planetary gear decelerating motor to both of the banknote temporary storage reel and the pair of tape withdrawing reel assemblies simultaneously, wherein the synchronous gear transmission system comprises a first gear configured to drive the banknote temporary storage reel, a first transmission gear set engaged with the driving gear and transmitting power to both of the banknote temporary storage reel and the first tape withdrawing reel assembly simultaneously, and a second transmission gear set connecting the first gear and the second tape withdrawing reel assembly and transmitting power to the second tape withdrawing reel assembly.