The utility model relates to a wide area real time encrypting apparatus for protecting a system data communication network which comprises an emitting communication apparatus (A) and a receiving communication apparatus (B). The emitting communication apparatus (A) is provided therein with a data emitting and communication interface unit, a real time encrypting unit, and an emitting time parameter formed cypher unit. The receiving communication apparatus (B) is provided therein with a data receiving communication interface unit, a real time de-cyphering unit (1), another real time deciphering unit (2) and a receiving time parameter formed cypher unit. The encrypting apparatus provided by the utility model is provided with a real time encrypting unit and a data communication interface unit, making it able to provide wide area protection on system communication data reporting and to hide information on logic channels. The adoption of a DES encrypting method or the adoption of an anti-code to encrypt information makes the enciphered code on constant change in accordance to time signals. The constant change of the enciphered code makes the apparatus hard to be deciphered from outside attackers. Even an outside attacker uses a general data bag interceptor, the interceptor fails to identity normal data frame format and cannot read out intercepted messages either.