POS machine

The invention discloses a POS machine. The POS machine includes a shell, a payment terminal, a memory card and a virtual server; the virtual server comprises a PSAM module, a communication module, an input module and a display module which can be installed on a mobile device; the communication module can build a communication connection with a bank back-end server through wireless communication; the PSAM module controls collection transactions of a plurality of payment terminals; the input module is used for receiving instruction information inputted by a user according to a payment or collection flow after establishing communication connections with the payment terminal and the virtual server; and the display module is used for displaying payment or collection operation information. According to the POS machine of the invention, the virtual transaction server is mounted on the mobile device in a downloadable manner, wherein the mobile device can be a mobile phone or a tablet PC. The POS machine has the advan