The invention discloses a method, a device and a system for charging VPN (Virtual Private Network) services. The method comprises the steps of: receiving a calling of a VPN user by the VPN services of an SCP (Service Control Point), selecting a charge scheme suitable for the current calling of the VPN user by the VPN services of the SCP according to VPN user information stored in local, and obtaining account information of the VPN user to an OCS (Online Charging System); and carrying out charging control and charging on the this-time calling of the VPN user by the VPN services of the SCP according to the charging scheme and the account information, sending the charging information to the OCS, and completing charging treatment by the OCS. According to the invention, the problems that the VPN service software is logically and repeatedly developed and the hardware equipment is repeatedly invested in a process of transferring SCP charging into OCS charging by a VPN service charging point to realize the charging infusion are solved, and the effect of reasonably utilizing resources is achieved.