EL tester auxiliary tool and EL tester

The invention discloses an EL tester auxiliary tool and an EL tester, a limiting mechanism of the EL tester is connected with a measuring ruler body, the measuring ruler body comprises a first measuring ruler and a second measuring ruler, and after the limiting mechanism limits a photovoltaic module located on an EL tester workbench to a preset position, the photovoltaic module is connected with the first measuring ruler and the second measuring ruler; the first measuring scale and the second measuring scale of the measuring scale body are aligned with the edge of the photovoltaic module, the creepage distance of the photovoltaic module is measured, the EL tester judges the covering condition of the photovoltaic module by the measuring scale body through imaging of the photovoltaic module on the imaging screen, and then whether the creepage distance of the photovoltaic module meets the requirement or not is automatically obtained. The creepage distance of the photovoltaic module is automatically detected, the