The invention provides an intelligent mail box which comprises a box body, a box opening code input device and a communication unit, wherein the box body comprises a door with a lock; the box opening code input device is used for inputting a box opening code to unlock and open the box; the communication unit is used for communication with a remote management terminal; a memorizer is further arranged at the mail box or the remote management terminal, and used for memorizing at least one or more preset box opening codes; a processor is arranged at the mail box or the remote management terminal, is used for identifying whether the input box opening code is matched with the one or more preset box opening codes, and can give a box opening instruction if matched; the processor comprises a box opening code management circuit which is used for allowing the matched box opening code to be invalid after box opening and generating a new box opening code when no valid box opening code exists at present; and the processor can memorize the new box opening code in the memorizer. With the adoption of the intelligent mail box, a mail can be securely, conveniently and automatically received and/or sent.