The utility model discloses an anti - island protection tester of distributing type photovoltaic inverter, the power distribution box comprises a box body, the top of box is equipped with display screen and information transmission means, the bottom of display screen is equipped with the rotary rod, the both ends of rotary rod all are equipped with the fixed axle, the surface of box is equipped with the operation touch -sensitive screen, the inside of operation touch -sensitive screen is equipped with memory chip, one side is equipped with a plurality of buttons, the inside of box is equipped with current transformer, one side of current transformer is equipped with voltage transformer, equal and the information transmission means electric connection of current transformer and voltage transformer, this kind of tester passes through current transformer and voltage transformer, give information transmission means with the information feedback of electric current and voltage, rethread memory chip, with the information storage at the operation touch -sensitive screen, rethread button and display screen, can carry out the analysis by the efficient, and show on the display screen, let the staff see clearlyer, thereby it is more accurate to make the result of test, thereby the protection that the realization was incorporated into the power networks to photovoltaic electric power.