The utility model relates to the technical field of electric measurement, and concretely relates to an electric power alternating current analog quantity signal measuring device based on linear optocouplers, which is used for direct current signal measurement and detection at a secondary side of an electrical power system field test. The electric power alternating current analog quantity signal measuring device based on linear optocouplers comprises a lower computer provided with modularized functional hardware, an upper computer and application software; plug-in type connection is adopted inside the machine box of the lower computer, and a linear optocoupler circuit is arranged in a direct current isolation circuit of the lower computer. The device provided by the utility model has the advantages that the device is a portable electric quantity analyzer, and a linear optocoupler isolation technology is adopted in the internal direct current isolation technology; signals measured by the linear optocoupler isolation technology are AC/DC universal signals; and in the adopted linear optocoupler isolation circuit, a primary side is adopted to raise the signals while a secondary side is adopted to lower the signals, so as to measure the alternating current signals.