The invention discloses a field measurement standard device of an insulated online monitoring device. The device comprises a shell, and a relative dielectric loss and zinc oxide arrester resistive current analog signal generator and a standard tester, which are arranged in the shell; a first current output terminal, a second current output terminal and a voltage output terminal connected with the relative dielectric loss and zinc oxide arrester resistive current analog signal generator are arranged on the shell, a first current signal is transmitted by the first current output terminal onto a detected online monitoring device, and the first current signal is further transmitted onto the standard tester through a first high precision punch current transformer arranged in the shell; a switching device is further arranged in the shell. The field measurement standard device disclosed by the invention has the advantages of reasonable design, simple structure, small volume, light weight and simple operation, and the field measurement standard device can be used for verifying the dielectric loss factor and the capacitance of capacitive equipment on site and verifying the online or charged test device of resistive current or capacitive current of a metal oxide arrester.