The invention discloses a data sharing method for land-saving power dispatching automation systems. The data sharing method is characterized by comprising the following steps: 1) a user makes a demand data list by using a real-time data subscription/unsubscription tool of a local scheduling system, and sends a subscription request to an opposite terminal scheduling system; 2) the opposite terminal scheduling system sends real-time data in the demand data list to the local scheduling system in real time after receiving the subscribe request; 3) the user sends a unsubscription request by using the real-time data subscription/unsubscription tool of the local scheduling system; and 4) the opposite terminal scheduling system terminates sending the real-time data in real time after receiving the unsubscription request, and deletes the demand data list. The data sharing method has the advantages that: the user can flexibly require the demanded real-time data from other systems according to the current requirements of the system, the daily use and management of the user are facilitated, and the response capacity of the system in an emergency is improved.