The invention discloses an invoicing monitoring device, an invoicing
system and an invoicing method applied to tax control. The invoicing
system comprises the invoicing monitoring device, host
terminal equipment and mobile storage equipment, wherein the invoicing monitoring device comprises a master control security
chip, a
wireless communication module and a real-time
clock and also comprises a chargeable battery and a
button battery, the chargeable battery supplies power to the
chip and the
wireless communication module, and the
button battery supplies power to a
clock; the master control security
chip comprises a
security information storage unit, a
user information storage unit and an invoicing monitoring unit, wherein the
security information storage unit is used for calculating the
encryption algorithm and the
encryption key of a tax control code, the
user information storage unit is used for storing the relevant
invoice information of a taxpayer, and the invoicing monitoring unit is used for judging whether
invoice detail data is legal or not; and the mobile storage equipment is used for storing the
invoice detail data and the tax control code sent from the host
terminal equipment. The invoicing monitoring device can be manufactured into portable equipment with small volume. Through the invoicing
system and the method, invoicing and tax return flexibility and convenience can be effectively improved so as to better meet the use requirements of users.