A data collection device for integrating substation data into a PI system relates to the electric power system equipment. The prior art has the shortcomings of poor reliability and integrity, the data collection device comprises a plurality of collection plates for collecting and forwarding the data and a management plate which processes the data which is collected by the collection plates, physical isolation channels are respectively arranged on the collection plates and the management plate, the management plate is connected with a human-computer interaction module, the collection device further comprise a dual-power supply module which supplies power to the collection plates and the management plate. The data collection device can not only ensure the accuracy and the integrity of the data collection, but can also improve the safety of the system and have convenient usage and maintenance by the collection plates and the management plate which are provided with the one-way physical isolation.