The utility model relates to an overvoltage data acquisition storage system, which comprises an operational amplifier, a filter, an analog-to-digital converter, a synchronous dynamic random access memory, a PCI interface, a clock chip, a FPGA chip and a power source; wherein, the operational amplifier, the filter, the analog-to-digital converter, the synchronous dynamic random access memory and the PCI interface are connected in order; the operational amplifier receives the overvoltage signal; the FPGA chip are respectively connected to the analog-to-digital converter and the synchronous dynamic random access memory; the power source is respectively connected to the operational amplifier, the filter and the FPGA; and the clock chip is connected to the FPGA chip. According to the utility model, the high sampling precision can be obtained on the basis of guarantee of acquisition rate, and errors such as data loss can be avoided when the outer and inner overvoltage are acquired.