Based on the study of low voltage differential signal（LVDS） high-speed serial bus， a construction method of an object-oriented unified hardware platform of automation devices for smart substation is proposed. LVDS is one kind of data transmission technology with excellent performance. High-speed serial bus of automation device can be constructed with LVDS for smart substation. High-speed serial bus is analyzed in detail and the construction method of smart substation hardware platform is expounded. In addition， the hardware implementation of smart substation automation typical devices with the hardware platform are proposed. Based on this hardware platform， automation devices used in various voltage-level smart substation can be constructed， the workload for developing and maintaining automation devices used in smart substation can be simplified in this way.