The present invention relates to a mobile payment licensing method and a system thereof. The method comprises the following steps: a main user terminal is bound with a payment account; the main user terminal and a slave user terminal respectively log into a server, and the main user terminal sends a sublicensing request to the server; the server verifies the sublicensing request and issues a Token and a transaction secret key to the slave user terminal after the sublicensing request passes the verification; and the slave user terminal carries out payment according to the Token and the transaction secret key. According to the present invention, mobile payment sublicensing between family members and friends may be achieved on the basis of trust, and using the Token and the transaction secret key may ensure security of the transaction. Additionally, when a user is paying, the user does not need to input a password, thus making payment quick and convenient and providing a good user experience. Furthermore, a user end mobile phone may achieve the payment transaction without needing to connect to the Internet.