The invention provides a method and device for universal data access. The method comprises the steps that an access request sent by a received data access interface through a Web Service interface service is responded, destination monitoring data corresponding to the access request in monitoring data provided by a monitoring device are obtained, the destination monitoring data are sent in batches through the call of the Web Service interface service, and each part of the destination monitoring data which are sent in batches are written in a real-time/historical database, so that the monitoring device of each manufacturer enables the monitoring data to have access to the real-time/historical database directly through the method and device for universal data access. In the access process, the problem that a bottom-layer API of the real-time/historical database needs to be directly called is solved through use of the Web Service interface service, so that in the data access process and on the bases that the development cost is reduced and the data management efficiency is improved, the data safety is guaranteed and the data access efficiency is improved.