This application discloses a method and device for sending and receiving instruction information. The method for sending instruction information includes: receiving first instruction information and/or operation description information of an operation corresponding to the first instruction information; if the first instruction information is received, temporarily storing the received first instruction information locally; and/or if the operation description information is received, transmitting the operation description information to a mobile terminal; acquiring a first differential signal that is output from a data transmission interface of the mobile terminal and carries the first instruction information and/or the second instruction information; and/or acquiring the first differential signal if a trigger signal sent by the receiving device is received; generating, according to the acquired first differential signal, a first transmission signal that carries the first instruction information, and sending the first transmission signal to the receiving device.