The invention discloses a frequency converter dead-time compensation method. The method comprises the steps that the phase voltage output by a frequency converter is parted, and partial voltage signals are obtained; two reference voltages are generated, and the partial voltage signals are compared with two reference voltage input comparator units; actual phase voltage conduction time of the frequency converter is computed according to comparison signals output by the comparator units; the actual phase voltage conduction time is compared with the ideal phase voltage conduction time, dead-time of the frequency converter is computed, and therefore the dead-time compensation can be conducted on the frequency converter according to the dead-time. The embodiment of the invention further provides a frequency converter dead-time compensation device. According to the technical scheme, due to the fact that zero crossing point detection forecast or prediction does not need to be conducted on currents, and current directions does not need to be judged, therefore, the problems that zero current clamping exists in an existing dead-time compensation method and the current directions are prone to being mistakenly judged can be solved, and system stability is improved.