Residential rooftop photovoltaic panel terminal voltage automatic alignment device

The invention discloses a residential rooftop photovoltaic panel terminal voltage automatic alignment device comprising a case, a working power supply, a voltage connecting post, two display tubes which are bound with the voltage connecting post, a primary voltage line loop, a parallel voltage line loop, a relay coil loop and a master controller panel. Two cycles are configured for the master controller panel, wherein the first cycle object is the primary voltage line loop relay and the second cycle object is the parallel voltage line loop relay. The first and second cycles connect the corresponding relay coil loop of the cycle number. The master controller panel outputs and controls the position number of each item of the voltage value array in the unique set of monotonic ascending sequence to the corresponding display tubes to display the position number. Digital tags consistent with the two digits of each display tube are manufactured and adhered on the voltage connecting post photovoltaic panel terminal v