The invention provides a dialing method and system based on a PPPOE network, and a router. The method comprises the steps: S1, enabling a terminal to receive a dialing instruction of a user; S2, judging whether there is a last conversation or not: switching to step S3 when there is the last conversation, or else, switching to step S4, wherein the conversation is between the terminal and an access server; S3, transmitting a grouping ending message to the access server, and enabling the access server to end the conversation with the terminal; S4, enabling the terminal to enter a conversation initializing phase; S5, enabling the terminal to enter a conversation phase. According to the invention, when the dialing instruction of the user is received, the method firstly judges whether the terminal is in the last conversation or not, i.e., judging whether the terminal is currently disconnected with the access server in a normal manner or not. If the terminal is not disconnected with the access server in a normal manner, the method firstly transmits the grouping ending message, so as to enable the connection between the terminal and the access server to be cut off, thereby facilitating the normal conversation connection between the terminal and the access server, and improving the connection speed and efficiency.