The invention provides a method and a system for reminding a state change of a mobile terminal. The method comprises the following steps of receiving a state reminding instruction sent by a first terminal, wherein the state reminding instruction includes first identity information of the first terminal and second identity information of a second terminal; querying a current terminal state of the second terminal according to the second identity information; obtaining a preset standard terminal state of the first terminal and a reminding way corresponding to the standard terminal state according to the first identity information; and if the current terminal state is consistent to the standard terminal state, adopting the reminding way to send a reminding message for the state change of the second terminal to the first terminal. According to the method and the system for reminding the state change of the mobile terminal, which are provided by the invention, a lot of time of a user is not needed, and furthermore, state information is not stored on the terminal, and the occupancy rate of network resources is reduced, so that the stability and the reliability of communication between the terminals are guaranteed, and thus the practicability of the method is improved.