The invention provides an optical alignment device for a liquid crystal display panel. The optical alignment device is used for carrying out optical alignment on the liquid crystal display panel. The liquid crystal display panel comprises a liner used for applying alignment voltage. The optical alignment device comprises a voltage generation power supply and a probe, wherein the voltage generation power supply is used for providing total alignment voltage, the probe is connected with the voltage generation power supply through a connecting wire and used for providing alignment voltage for a display zone of the liquid crystal display panel, and an adjustable resistor is arranged on the connecting wire. According to the optical alignment device for the liquid crystal display panel, by arranging the adjustable resistor on the connecting wire through which the probe and the voltage generation power supply are connected, the alignment voltage of a power system can be conveniently adjusted, and thus the operation and design difficulty of the power system is lowered.