The invention provides a higher harmonic voltage test system, which comprises a metal oxide lightning arrester voltage sensor and a power quality on-line detection device. The metal oxide lightning arrester voltage sensor is connected with the power quality on-line detection device through a shield cable. The metal oxide lightning arrester voltage sensor is a metal oxide lightning arrester voltage-division broadband voltage sensor. On the one hand, when the system works normally, the metal oxide lightning arrester voltage sensor realizes capacitive voltage division and is directly grounded, thereby eliminating the influence of a resonance eliminator on zero-sequence harmonic voltage in the conventional power quality test process, and improving measurement precision; and on the other hand,capacitive voltage division and resistive voltage division are linear, voltage division signals and primary signals are in a linear relation, and distortion of higher harmonic voltage measurement signal does not exist, thereby improving harmonic voltage measurement bandwidth and improving higher harmonic voltage measurement precision.