The disclosure discloses a method for positioning a mobile terminal, which comprises: a server sends a push notification to a mobile terminal; the mobile terminal performs self-positioning after receiving the push notification, to acquire geographical position information regarding the mobile terminal, and sends the geographical position information to the server; the server receives and displays the geographical position information sent by the mobile terminal. The disclosure also discloses a system for positioning a mobile terminal for implementing the method for positioning a mobile terminal and a mobile terminal. With such method and device, the server can be used to send a push notification to the mobile terminal after a user finds that the mobile terminal is lost. The mobile terminal positions geographical position information thereof and sends the geographical position information to the server to help the user retrieve the mobile terminal.