The invention relates to a steady data synchronous screening method and a telemechanical forwarding device using the same. According to the synchronous screening method, steady data, collected by a scheduling end, of different transformer stations and different intervals is in alignment according to the same time section. A remote measurement sending idea combining abrupt changes and circulation always adopted by the prior art is avoided. A quite unique idea, i.e., an idea of data synchronous screening by a power balance method is adopted, so synchronous data is packed and sent after being screened. The method meets the requirement that a scheduling main station needs to obtain data of the same time section.