The invention discloses an electric power data collection monitoring system which can ensure stable obtaining of data. The electric power data collection monitoring system runs based on data communication of a system bus and comprises an electric power data collecting end arranged on the system bus and an electric power data transmitting end which is communicated with the electric power data collecting end and arranged on the system bus, wherein the electric power data collecting end is designed to collect voltage variation amount carrying data communication content on the system bus, the electric power data collecting end comprises a plurality of communication interface circuits, a feed circuit, a conversion circuit, a voltage stabilization and filter circuit and a switching circuit, wherein the communication interface circuits are electrically coupled with the system bus, the feed circuit is electrically connected with the communication interface circuits, the conversion circuit is electrically connected with the communication interface circuits, the voltage stabilization and filter circuit is attached to the conversion circuit, and the switching circuit is electrically connected with the voltage stabilization and filter circuit.