The invention relates to a bank book reading and writing device supporting two-dimensional bar code bank books. The defects in the prior art are overcome. According to the technical scheme, the bank book reading and writing device is in communication with a computer, is supplied with power by a power supply, and comprises a shell, wherein a bank book channel with a horizontal opening is formed in the shell; the bank book reading and writing device further comprises a two-dimensional bar code reading unit, a magnetic bar reading and writing unit, a printing unit, a communication unit and a transmission unit; the printing unit is fixed to the front end of the transmission unit, the transmission unit is fixed in the shell and connected with the communication unit, the two-dimensional bar code reading unit and the magnetic bar reading and writing unit are fixed to the upper side wall of the bank book channel, aligned with the horizontal opening of the bank book channel, and electrically connected with the communication unit, and the communication unit outputs communication signals to be in communication with the computer.