The present invention discloses an apparatus for applying curing voltages to a liquid crystal substrate. The apparatus includes a plurality of probes, a detecting unit, and an alarm unit. The probes are utilized to apply a voltage to the liquid crystal substrate. The detecting unit is electrically coupled to the probes for determining whether the curing voltages are within a threshold range. The alarm unit is electrically coupled to the detecting unit for giving an alarm prompt when the voltage is not within the threshold range, so as to remind a person without delay. Therefore, the curing voltage applying apparatus of the present invention is capable of increasing product yield, so as to reduce production costs.