The utility model provides a real-time data acquisition device, which is applied to an electric precipitation system and comprises a front acquisition module, a safety isolation module, a data sendingmodule and a cabinet. Wherein the front acquisition module is used for performing data acquisition on multiple paths of data sources of the control host; the security isolation module is used for unidirectionally transmitting the data signal acquired by the front acquisition module to the data sending module; the data sending module is used for remotely sending the data signal; and the front acquisition module, the security isolation module and the data sending module are located in the same cabinet. By utilizing the device provided by the utility model, the working condition data change of the boiler side can be transmitted to the cloud data center in real time to be stored and analyzed, so that the set parameters of equipment in the electric precipitation system can be updated in time,and the problem of automatic information isolated island of the existing electric precipitation system is solved.