The invention discloses a heavy truck diesel vehicle storage battery equalization performance monitoring device. The heavy truck diesel vehicle storage battery equalization performance monitoring device comprises a storage battery interface (1), a voltage sampling unit (2), a voltage operating unit (3), an automatic polarity correction unit (4), an impedance conversion unit (5), a divider resistance network unit (6), a voltage reference unit (7), voltage comparison units (8) and an indication unit (9). The heavy truck diesel vehicle storage battery equalization performance monitoring device has the working principle that voltage signals of two serially-connected storage battery packs provided through the storage battery interface are reversely and symmetrically sampled through the voltage sampling unit, and the voltage signals are delivered into the voltage operating unit; positive unbalanced voltage is output by processing an operating result through the automatic polarity correction unit; a high-impedance voltage signal is converted into a low-impedance voltage signal to be output through the impedance conversion unit; the low-impedance voltage signal is output to each voltage comparison unit through the divider resistance network unit; a signal used for driving a light emitting diode to emit light is output after comparing the low-impedance voltage signal with a reference voltage signal; the indication unit formed by the light emitting diode is used for indicating the voltage unbalance degree of the two storage battery packs, so that a driver is reminded to carry out equalizing charging on the storage battery packs or to replace the storage battery packs through a direct display way.