Provided are a leakage protector based on life body electric shock feature recognition and a leakage protection method thereof. The leakage protector based on life body electric shock feature recognition comprises a data acquisition unit, a signal processing unit and a protection unit which are connected in sequence. The data acquisition unit is used for acquiring the total residual current and a line voltage signal of a power grid line, the signal processing unit is used for recognizing an electric leakage signal and sending out an outage control instruction, and the protection unit is used for turning off the power grid line after receiving the outage control instruction. The leakage protection method comprises the steps of acquiring the total residual current and the line voltage signal, performing even sampling, calculating a total residual current change vector, calculating complex impedance, calculating impedance semicircle center and radius, calculating a frequency dispersion coefficient and impedance characteristic frequency and judging whether a lift body is subjected to electric shock or not. The leakage protector based on life body electric shock feature recognition and the leakage protection method have the advantages that the leakage protector and the leakage protection method do not depend on a residual current amplitude or the change amount of the residual current amplitude is larger than a setting value. When the leakage protector recognizes a life body electric shock feature, the leakage protector can immediately act, has ideal protective operating characteristic and is especially suitable for last-stage protection of low-voltage power distribution network three-phase four-wire system lines.