The utility model relates to a synchronous acquisition device for PT signals of a bus of a power distribution network. The synchronous acquisition device mainly comprises an FPGA, an analog-to-digitalconverter, a trigger, an SRAM and a communication interface, in the device, an FPGA is adopted to perform synchronous control on a plurality of analog-to-digital converters, an SRAM serves as an acquisition device cache and is connected to the FPGA through a storage bus to realize a data buffer function, and an external synchronous interface is integrated with a communication interface and can communicate with external equipment through buses such as a serial USB and a network. The FPGA can automatically perform self-inspection on functional modules such as an SRAM and an ADC; when the effective level pulse is detected by the external trigger input; the device immediately carries out rapid synchronous data acquisition on signals accessed to a PT terminal of a bus, synchronously obtains ABC three-phase PT voltage signals and N-phase neutral point voltage signals of the same bus, temporarily stores the signals in an SRAM of the device in sequence, and notifies external equipment to process data of the acquisition process through a communication interface; according to the utility model, the purposes of improving the acquisition standard and realizing high-precision synchronous acquisition are achieved.